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Journal articles on the topic 'Infrared spectra. Absorption spectra. Methane'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Dagg, I. R., A. Anderson, S. Yan, W. Smith, C. G. Joslin, and L. A. A. Read. "Collision-induced absorption in gaseous mixtures of nitrogen and methane." Canadian Journal of Physics 64, no. 11 (1986): 1467–74. http://dx.doi.org/10.1139/p86-260.

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The collision-induced absorption spectra of nitrogen–methane gas mixtures have been measured in the spectral region below 400 cm−1 at four temperatures, namely, 212, 179, 149, and 126 K. The measurements have involved the use of Fourier-transform infrared and microwave techniques as well as a far-infrared laser operating at 84.2 and at 15.1 cm−1. These are compared with a theoretical line shape obtained from a convolution of free rotational spectra and a translational component as determined from information theory. The calculated spectra show good agreement with the experimental results only

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2

Geballe, T. R., X. Fan, D. A. Golimowski, G. R. Knapp, and S. K. Leggett. "The Transition from L to T: Chemistry and Classification." Symposium - International Astronomical Union 211 (2003): 369–76. http://dx.doi.org/10.1017/s0074180900210942.

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The growing numbers of brown dwarfs have largely been divided into two new spectral classes, L and T. Subclassification systems for L, based on optical (0.6–1.0 μm) spectra, have existed since 1999, but there is a need for infrared systems for both spectral classes. The differences in the infrared (1.0–2.5 μm) characteristics of L spectra and T spectra observed prior to 2000 are huge, all then-known T dwarfs showing strong methane absorption bands, and all L dwarfs devoid of these bands. However, in the last 2–3 years a significant number of brown dwarfs with infrared spectra in transition bet

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3

Abbas, Muhammad Ali, Luuk van Dijk, Khalil Eslami Jahromi, Mohammadreza Nematollahi, Frans J. M. Harren, and Amir Khodabakhsh. "Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer." Sensors 20, no. 23 (2020): 6831. http://dx.doi.org/10.3390/s20236831.

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Conventional mechanical Fourier Transform Spectrometers (FTS) can simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times to achieve time-resolved spectra with a good spectral and temporal resolution. Here, we present a mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband absorption and dispersion spectra with a spectral resolution of 5 GHz (0.18 nm at a wavelength of 3333 nm), a temporal resolution of 20 μs, a total wavelength coverage over 300 cm−1 and a total measurement time of ~70

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4

Lu, Hsiao-Chi, Jen-Iu Lo, Meng-Yeh Lin, et al. "Infrared absorption spectra of methylidene radicals in solid neon." Chem. Commun. 50, no. 59 (2014): 7968–70. http://dx.doi.org/10.1039/c4cc02970d.

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5

Dore, P., and A. Filabozzi. "Far infrared absorption of the gaseous CH4–Ar mixture." Canadian Journal of Physics 68, no. 10 (1990): 1196–99. http://dx.doi.org/10.1139/p90-169.

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We present the first measurements of the rototranslational absorption spectrum of the CH4–Ar gaseous system in the far infrared region 40–600 cm−1. Measurements were made at 296, 243, and 195 K at densities as low as possible; the binary absorption spectrum of the CH4–Ar pair was then obtained. We performed a line-shape analysis of these spectra following the procedure previously introduced for pure methane. We find that the experimental data can be described at high frequencies by using ab initio values of the octopole and hexadecapole multipole moments and anisotropic overlap intensities ver

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6

Razavi, A., C. Clerbaux, C. Wespes, et al. "Characterization of methane retrievals from the IASI space-borne sounder." Atmospheric Chemistry and Physics Discussions 9, no. 2 (2009): 7615–43. http://dx.doi.org/10.5194/acpd-9-7615-2009.

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Abstract. Although the global methane (CH4) concentration has more than doubled since pre-industrial times, local emission sources are still poorly identified and quantified. Instruments onboard satellites can improve our knowledge about the methane global distribution owing to their very good spatial coverage. The IASI (Infrared Atmospheric Sounding Interferometer) instrument launched on the European MetOp platform is a Fourier transform spectrometer which measures the thermal infrared radiation emitted by the Earth and its atmosphere. In this paper, we present the first global distribution o

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7

Bruhns, Henry, Marcus Wolff, Yannick Saalberg, and Klaus Spohr. "Quantitative Evaluation of Broadband Photoacoustic Spectroscopy in the Infrared with an Optical Parametric Oscillator." Sensors 18, no. 11 (2018): 3971. http://dx.doi.org/10.3390/s18113971.

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We evaluate the spectral resolution and the detection thresholds achievable for a photoacoustic spectroscopy (PAS) system in the broadband infrared wavelength region 3270 n m ≲ λ ≲ 3530 n m driven by a continuous wave optical parametric oscillator (OPO) with P ¯ ≈ 1.26 W . The absorption spectra, I PAS ( λ i ) , for diluted propane, ethane and methane test gases at low concentrations ( c ∼ 100 ppm ) were measured for ∼1350 discrete wavelengths λ i . The I PAS ( λ i ) spectra were then compared to the high resolution cross section data, σ FTIR , obtained by Fourier Transform Infrared Spectrosco

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8

Checa-Garcia, R., J. Landgraf, A. Galli, et al. "Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor." Atmospheric Measurement Techniques 8, no. 9 (2015): 3617–29. http://dx.doi.org/10.5194/amt-8-3617-2015.

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Abstract. Sentinel-5 (S5) and its precursor (S5P) are future European satellite missions aiming at global monitoring of methane (CH4) column-average dry air mole fractions (XCH4). The spectrometers to be deployed onboard the satellites record spectra of sunlight backscattered from the Earth's surface and atmosphere. In particular, they exploit CH4 absorption in the shortwave infrared spectral range around 1.65 μm (S5 only) and 2.35 μm (both S5 and S5P) wavelength. Given an accuracy goal of better than 2 % for XCH4 to be delivered on regional scales, assessment and reduction of potential source

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9

Checa-Garcia, R., J. Landgraf, F. Hase, et al. "Mapping spectroscopic uncertainties into prospective methane retrieval errors from Sentinel-5 and its precursor." Atmospheric Measurement Techniques Discussions 8, no. 1 (2015): 1333–63. http://dx.doi.org/10.5194/amtd-8-1333-2015.

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Abstract. Sentinel-5 (S5) and its precursor (S5P) are future European satellite missions aiming at global monitoring of methane (CH4) column average dry air mole fractions (XCH4). The spectrometers to be deployed on-board the satellites record spectra of sunlight backscattered from the Earth's surface and atmosphere. In particular, they exploit CH4 absorption in the shortwave infrared spectral range around 1.65 μm (S5 only) and 2.35 μm (both, S5 and S5P) wavelength. Given an accuracy goal of better than 2% for XCH4 to be delivered on regional scales, assessment and reduction of potential sourc

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10

Doroshenko, Irina, Valeriy Pogorelov, and Valdas Sablinskas. "Infrared Absorption Spectra of Monohydric Alcohols." Dataset Papers in Chemistry 2013 (October 24, 2013): 1–6. http://dx.doi.org/10.7167/2013/329406.

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FTIR spectra of homologous series of monohydric alcohols which belong to the class of partly ordered liquids were registered. The molecules of monohydric alcohols containing hydroxyl group are able to form hydrogen-bonded clusters in the condensed phase. The existence of clusters is clearly observed from the position and the contour of the stretch OH band in the vibrational spectra of liquid alcohols. In this work, the experimentally registered FTIR spectra of liquid n-alcohols from methanol to decanol are presented as well as the same spectra of methanol, ethanol, propanol, butanol, pentanol,

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11

Razavi, A., C. Clerbaux, C. Wespes, et al. "Characterization of methane retrievals from the IASI space-borne sounder." Atmospheric Chemistry and Physics 9, no. 20 (2009): 7889–99. http://dx.doi.org/10.5194/acp-9-7889-2009.

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Abstract. Although the global methane (CH4) concentration has more than doubled since pre-industrial times, local emission sources are still poorly identified and quantified. Instruments onboard satellites can improve our knowledge about the methane global distribution owing to their very good spatial coverage. The IASI (Infrared Atmospheric Sounding Interferometer) instrument launched on the European MetOp-A platform is a Fourier transform spectrometer which measures the thermal infrared radiation emitted by the Earth and its atmosphere. In this paper, we present the first global distribution

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12

Plavchan, Peter, Peter Gao, Jonathan Gagne, et al. "Precise Near-Infrared Radial Velocities." Proceedings of the International Astronomical Union 10, S314 (2015): 286–87. http://dx.doi.org/10.1017/s1743921315006468.

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AbstractWe present the results of two 2.3 μm near-infrared (NIR) radial velocity (RV) surveys to detect exoplanets around 36 nearby and young M dwarfs. We use the CSHELL spectrograph (R ~ 46,000) at the NASA InfraRed Telescope Facility (IRTF), combined with an isotopic methane absorption gas cell for common optical path relative wavelength calibration. We have developed a sophisticated RV forward modeling code that accounts for fringing and other instrumental artifacts present in the spectra. With a spectral grasp of only 5 nm, we are able to reach long-term radial velocity dispersions of ~20–

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13

Chen, Tingting, Chun Wang, Jingqiu Liang, and Jingsong Li. "Application of Derivative Transform Spectroscopy in Gas Detection." E3S Web of Conferences 299 (2021): 02005. http://dx.doi.org/10.1051/e3sconf/202129902005.

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Digital filtering technique is of great significance in real-time signal processing and analysis, but the stability, efficiency and flexibility of filter algorithm are important indicators to reflect its application value. In this paper, an adaptive derivative transformation based on Savitzky-Golay filter algorithm was proposed for laser absorption spectroscopy analysis. To demonstrate this analysis algorithm, first-order and second-order derivative spectroscopy are evaluated for the analysis of infrared methane absorption spectra, and compared with the original direct absorption spectral sign

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14

Merrelli, Aronne, and David D. Turner. "Comparing Information Content of Upwelling Far-Infrared and Midinfrared Radiance Spectra for Clear Atmosphere Profiling." Journal of Atmospheric and Oceanic Technology 29, no. 4 (2012): 510–26. http://dx.doi.org/10.1175/jtech-d-11-00113.1.

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Abstract The information content of high-spectral-resolution midinfrared (MIR; 650–2300 cm−1) and far-infrared (FIR; 200–685 cm−1) upwelling radiance spectra is calculated for clear-sky temperature and water vapor profiles. The wavenumber ranges of the two spectral bands overlap at the central absorption line in the CO2 ν2 absorption band, and each contains one side of the full absorption band. Each spectral band also includes a water vapor absorption band; the MIR contains the first vibrational–rotational absorption band, while the FIR contains the rotational absorption band. The upwelling sp

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15

Barres, O., A. Burneau, J. Dubessy, and M. Pagel. "Application of Micro-FT-IR Spectroscopy to Individual Hydrocarbon Fluid Inclusion Analysis." Applied Spectroscopy 41, no. 6 (1987): 1000–1008. http://dx.doi.org/10.1366/0003702874447743.

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Infrared spectra of fluid inclusions are obtained with a Fourier transform infrared miscrospectrometer. The experimental conditions and the analytical use are discussed. Interferograms are recorded in the transmission mode. The quality of spectra is good for fluid inclusions with diameters larger than 30 μm, the spectral resolution being 4 cm−1 and the recording time 200 s. Interferograms made of inclusions with diameters of less than 20 μm are reached in the same amount of time, but with worse spectral resolution. Infrared spectra are usually only suitable above 2000 cm−1, because of the abso

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16

Michaels, Chris A., Tony Masiello, and Pamela M. Chu. "Fourier Transform Spectrometry with a Near-Infrared Supercontinuum Source." Applied Spectroscopy 63, no. 5 (2009): 538–43. http://dx.doi.org/10.1366/000370209788346904.

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Optical fiber based supercontinuum light sources combine the brightness of lasers with the broad bandwidth of incandescent lamps and thus are promising candidates for sources in spectroscopic applications requiring high brightness and broad bandwidth. Herein, near-infrared (IR) Fourier transform (FT) spectrometry with a supercontinuum (SC) light source is investigated. The efficient, collimated propagation of broad bandwidth SC light through an 18 m path length multipass cell is demonstrated. A normalized spectral difference is calculated for the SC spectrum on consecutive FT mirror scans and

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17

Nakajima, Tadashi, Takashi Tsuji, and Kenshi Yanagisawa. "H- and K- Band Methane Features in an L Dwarf, 2MASS 0920+35." Symposium - International Astronomical Union 211 (2003): 423–24. http://dx.doi.org/10.1017/s0074180900211066.

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We have obtained near-infrared spectra of three L dwarfs discovered by 2MASS, 1146+22 (L3), 1507-16 (L5), and 0920+35 (L6.5). From the comparison of the H and K band spectra of these L dwarfs, we have found the presence of methane absorption in 0920+35. This implies that detectable methane absorption in the H and K bands, usually considered the signature of a T dwarf, can be present in objects classified optically as late L. Methane detection in L dwarfs is consistent with the presence of a dust layer deep in the atmosphere as the unified model of Tsuji suggests. (This work has been published

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18

Arrivo, S. M., V. D. Kleiman, W. T. Grubbs, T. P. Dougherty, and E. J. Heilweil. "Infrared Spectral Hole Burning of 1:1 Hydrogen-Bonded Complexes in Solution." Laser Chemistry 19, no. 1-4 (1999): 1–10. http://dx.doi.org/10.1155/1999/80323.

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Transient picosecond infrared (IR) spectra of the OH and NH-stretch (v=0–1) absorption bands of several hydrogen-bonded complexes have been investigated. Solutions of 1:1 complexes of weak acids (methanol, triethylsilanol and pyrrole, < 0.1 mol/dm3) and bases (acetonitrile, pyridine and tetrahydrofuran, < 2 mol/dm3) in CCl4 at 295 K were interrogated with IR excitation and broadband probing. Lorentzian-shaped absorption bands are uniformly bleached while those with near-Gaussian bandshapes produce transient spectral holes. These results indicate a base functionality and hydrogen-bond str

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19

Zhu, Ling Jian, Jian Hong Chen, Sha Sha Kang, and Yin Di Xiao. "Design of the Mixed Gas Quantitative Analysis Based on Grating Spectral." Applied Mechanics and Materials 241-244 (December 2012): 135–39. http://dx.doi.org/10.4028/www.scientific.net/amm.241-244.135.

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A method of mixed gas quantitative analysis with near infrared spectroscopy （NIR）is described. A single plane diffraction grating is used in the monochromatic spectrum system. A quantitative analysis system is designed and constructed according to the parameters of the monochromator. The narrowband beam testing and spectral scanning experiments with methane and ethane are carried out. A 10nm narrowband beam is successfully obtained by the monochromatic system when the entrance slit width is 2mm. And a step-scanning resolution of the outgoing beam’s centre wavelength with 0.1nm can be realized

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20

Bi, Xiang Xin, P. C. Eklund, J. G. Zhang, A. M. Rao, T. A. Perry, and C. P. Beetz. "Optical properties of chemical-vapor-deposited diamond films." Journal of Materials Research 5, no. 4 (1990): 811–17. http://dx.doi.org/10.1557/jmr.1990.0811.

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Results of room-temperature optical studies on ∼10 micron thick, free-standing diamond films are reported. The films were grown on Si(100) substrates by hot filament-assisted chemical vapor deposition (CVD) from a methane/hydrogen mixture. The as-grown, free surface of the films exhibited a surface roughness of scale σ ∼ 0.2 to 5 microns, depending on the methane/hydrogen mixture, which introduces significant optical scattering loss for frequencies greater than 0.5 eV. Specular reflection and transmission spectra in the range 0.01–10 eV were collected. Below the threshold for interband adsorpt

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21

Tam, Simon, Mario E. Fajardo, Hiroyuki Katsuki, Hiromichi Hoshina, Tomonari Wakabayashi, and Takamasa Momose. "High resolution infrared absorption spectra of methane molecules isolated in solid parahydrogen matrices." Journal of Chemical Physics 111, no. 9 (1999): 4191–98. http://dx.doi.org/10.1063/1.479717.

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22

Petersen, A. K., T. Warneke, C. Frankenberg, et al. "First ground-based FTIR-observations of methane in the tropics." Atmospheric Chemistry and Physics Discussions 10, no. 2 (2010): 2303–20. http://dx.doi.org/10.5194/acpd-10-2303-2010.

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Abstract. Total column concentrations and volume mixing ratio profiles of methane have been retrieved from ground-based solar absorption FTIR spectra in the near-infrared recorded in Paramaribo (Suriname). The methane FTIR observations are compared with TM5 model simulations and satellite observations from SCIAMACHY, and represent the first validation of SCIAMACHY retrievals in the tropics using ground-based remote sensing techniques. Apart from local biomass burning features, our methane FTIR observations agree well with the SCIAMACHY retrievals and TM5 model simulations.

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23

Remes, Zdenek, Ravi Vasudevan, Karol Jarolimek, Arno H. M. Smets, and Miro Zeman. "The Optical Spectra of a-Si:H and a-SiC:H Thin Films Measured by the Absolute Photothermal Deflection Spectroscopy (PDS)." Solid State Phenomena 213 (March 2014): 19–28. http://dx.doi.org/10.4028/www.scientific.net/ssp.213.19.

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The new absolute PDS setup allows to measure simultaneously the absolute values of the optical transmittance T, reflectance R and absorptance A spectra in the spectral range 280 2000 nm with the typical spectral resolution 10 nm in ultraviolet and visible spectral range and 20 nm in the near infrared region. The PDS setup provides the dynamic detection range in the optical absorptance up to 4 orders of magnitude using non-toxic liquid perfluorohexane Fluorinert FC72. Here we demonstrate the usability of this setup on a series of intrinsic as well as doped a-Si:H and a-SiC:H thin films deposite

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24

Brogi, M., P. Giacobbe, G. Guilluy, et al. "Exoplanet atmospheres with GIANO." Astronomy & Astrophysics 615 (July 2018): A16. http://dx.doi.org/10.1051/0004-6361/201732189.

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Context. High-resolution spectroscopy (R ≥ 20 000) at near-infrared wavelengths can be used to investigate the composition, structure, and circulation patterns of exoplanet atmospheres. However, up to now it has been the exclusive dominion of the biggest telescope facilities on the ground, due to the large amount of photons necessary to measure a signal in high-dispersion spectra. Aims. Here we show that spectrographs with a novel design – in particular a large spectral range – can open exoplanet characterisation to smaller telescope facilities too. We aim to demonstrate the concept on a serie

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25

Mitev, V. M., B. Stefanov, L. M. Ivanov, and G. M. Georgiev. "Infrared absorption spectra of methanol vapour: dimer and tetramer contributions." Journal of Molecular Structure 129, no. 1-2 (1985): 11–15. http://dx.doi.org/10.1016/0022-2860(85)80187-3.

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26

Meléndez, Juan, and Guillermo Guarnizo. "Fast Quantification of Air Pollutants by Mid-Infrared Hyperspectral Imaging and Principal Component Analysis." Sensors 21, no. 6 (2021): 2092. http://dx.doi.org/10.3390/s21062092.

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An imaging Fourier-transform spectrometer in the mid-infrared (1850–6667 cm−1) has been used to acquire transmittance spectra at a resolution of 1 cm−1 of three atmospheric pollutants with known column densities (Q): methane (258 ppm·m), nitrous oxide (107.5 ppm·m) and propane (215 ppm·m). Values of Q and T have been retrieved by fitting them with theoretical spectra generated with parameters from the HITRAN database, based on a radiometric model that takes into account gas absorption and emission, and the instrument lineshape function. A principal component analysis (PCA) of experimental data

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27

Petersen, A. K., T. Warneke, C. Frankenberg, et al. "First ground-based FTIR observations of methane in the inner tropics over several years." Atmospheric Chemistry and Physics 10, no. 15 (2010): 7231–39. http://dx.doi.org/10.5194/acp-10-7231-2010.

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Abstract. Total column concentrations of methane have been retrieved from ground-based solar absorption FTIR spectra in the near-infrared recorded in Paramaribo (Suriname). The methane FTIR observations are compared with TM5 model simulations and satellite observations from SCIAMACHY, and represent the first validation of SCIAMACHY retrievals in the inner tropics using ground-based remote sensing techniques. Apart from local biomass burning features, our methane FTIR observations agree well with TM5 model simulations. The comparison of the direct measured CH4/CO2 ratios by FTIR and satellite r

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28

Li, J., C. L. Curry, Z. Sun, and F. Zhang. "Overlap of Solar and Infrared Spectra and the Shortwave Radiative Effect of Methane." Journal of the Atmospheric Sciences 67, no. 7 (2010): 2372–89. http://dx.doi.org/10.1175/2010jas3282.1.

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Abstract This paper focuses on two shortcomings of radiative transfer codes commonly used in climate models. The first aspect concerns the partitioning of solar versus infrared spectral energy. In most climate models, the solar spectrum comprises wavelengths less than 4 μm with all incoming solar energy deposited in that range. In reality, however, the solar spectrum extends into the infrared, with about 12 W m−2 in the 4–1000-μm range. In this paper a simple method is proposed wherein the longwave radiative transfer equation with solar energy input is solved. In comparison with the traditiona

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29

Buchwitz, M., R. de Beek, K. Bramstedt, S. Noël, H. Bovensmann, and J. P. Burrows. "Global carbon monoxide as retrieved from SCIAMACHY by WFM-DOAS." Atmospheric Chemistry and Physics Discussions 4, no. 3 (2004): 2805–37. http://dx.doi.org/10.5194/acpd-4-2805-2004.

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Abstract. Vertical columns of CO have been retrieved from SCIAMACHY/ENVISAT short wave/near infrared (~2.3µm) nadir spectra using the Weighting Function Modified (WFM) DOAS retrieval algorithm. WFM-DOAS has been applied to a small spectral fitting window located in SCIAMACHY's channel 8 (~2365 nm) covering four CO absorption lines. The focus of this paper is to demonstrate that quantitative information on carbon monoxide (CO) on a global scale can be retrieved from SCIAMACHY. It is shown that plumes of CO resulting from, e.g. biomass burning in Africa, are clearly detectable with SCIAMACHY. Th

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30

Miyata, Koichi, Kazuo Kumagai, Kozo Nishimura, and Koji Kobashi. "Morphology of heavily B-doped diamond films." Journal of Materials Research 8, no. 11 (1993): 2845–57. http://dx.doi.org/10.1557/jmr.1993.2845.

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B-doped diamond films were synthesized by microwave plasma chemical vapor deposition using a mixture of methane (0.5% or 1.2%) and diborane (B2H6) below 50 ppm on either Si substrates or undoped diamond films that had been synthesized using 0.5% or 1.2% methane. The surface morphologies of the synthesized films were observed by Secondary Electron Microscopy, and the infrared absorption and Raman spectra were measured. It was found that when diborane concentration was low, B-doped films preferred (111) facets. On the other hand, high diborane concentrations resulted in a deposition of needle-li

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31

Landgraf, Jochen, Joost aan de Brugh, Remco Scheepmaker, et al. "Carbon monoxide total column retrievals from TROPOMI shortwave infrared measurements." Atmospheric Measurement Techniques 9, no. 10 (2016): 4955–75. http://dx.doi.org/10.5194/amt-9-4955-2016.

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Abstract. The Tropospheric Monitoring Instrument (TROPOMI) spectrometer is the single payload of the Copernicus Sentinel 5 Precursor (S5P) mission. It measures Earth radiance spectra in the shortwave infrared spectral range around 2.3 µm with a dedicated instrument module. These measurements provide carbon monoxide (CO) total column densities over land, which for clear sky conditions are highly sensitive to the tropospheric boundary layer. For cloudy atmospheres over land and ocean, the column sensitivity changes according to the light path through the atmosphere. In this study, we present the

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32

McNesby, Kevin L., Robert G. Daniel, Andrzej W. Miziolek, and Steven H. Modiano. "Optical Measurement of Toxic Gases Produced during Firefighting Using Halons." Applied Spectroscopy 51, no. 5 (1997): 678–83. http://dx.doi.org/10.1366/0003702971940819.

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Several optical techniques (FT-IR emission and absorption spectroscopy, mid- and near-infrared tunable diode laser absorption spectroscopy) have been used to measure toxic gases produced during inhibition of flames by halogenated hydrocarbons (Halons). Fire types studied include low-pressure premixed flames, counterflow diffusion atmospheric-pressure flames, open-air JP-8 (turbine fuel) fires, and confined JP-8 fires. Spectra are presented and analyzed for these fires inhibited by CF3Br (Halon 1301) and C3F7H (FM-200). For low-pressure premixed flames, spectra are presented which show producti

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33

Sepúlveda, E., M. Schneider, F. Hase, et al. "Long-term validation of total and tropospheric column-averaged CH<sub>4</sub> mole fractions obtained by mid-infrared ground-based FTIR spectrometry." Atmospheric Measurement Techniques Discussions 5, no. 1 (2012): 1381–430. http://dx.doi.org/10.5194/amtd-5-1381-2012.

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Abstract. At the Izaña Atmospheric Research Center high-resolution middle infrared solar absorption spectra have been recorded for more than 12 years using Fourier Transform InfraRed (FTIR) spectrometers. We use the spectral fitting algorithm PROFFIT to retrieve long-term time series of methane (CH4) from the measured spectra. We investigate the total column-averaged dry-air mole fractions of methane (totXCH4) obtained from a scaling and a profile retrieval, and apply two approaches for deriving the tropospheric column-averaged dry-air mole fractions: firstly, we use the FTIR Hydrogen Fluoride

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34

Bader, W., T. Stavrakou, J. F. Muller, et al. "Long-term evolution and seasonal modulation of methanol above Jungfraujoch (46.5° N, 8.0° E): optimisation of the retrieval strategy, comparison with model simulations and independent observations." Atmospheric Measurement Techniques Discussions 7, no. 5 (2014): 4659–92. http://dx.doi.org/10.5194/amtd-7-4659-2014.

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Abstract. Methanol (CH3OH) is the second most abundant organic compound in the Earth's atmosphere after methane. In this work, we present the first long-term time series of methanol total, lower tropospheric and upper tropospheric-lower stratospheric partial columns derived from the analysis of high resolution Fourier transform infrared solar spectra recorded at the Jungfraujoch station (46.5° N, 3580 m a.s.l.). The retrieval of methanol is very challenging due to strong absorptions of ozone in the region of the selected υ8 band of CH3OH. Two wide spectral intervals have been defined and adjus

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35

Butz, A., J. Orphal, R. Checa-Garcia, et al. "Geostationary Emission Explorer for Europe (G3E): mission concept and initial performance assessment." Atmospheric Measurement Techniques 8, no. 11 (2015): 4719–34. http://dx.doi.org/10.5194/amt-8-4719-2015.

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Abstract. The Geostationary Emission Explorer for Europe (G3E) is a concept for a geostationary satellite sounder that aims to constrain the sources and sinks of greenhouse gases carbon dioxide (CO2) and methane (CH4) for continental-scale regions. Its primary focus is on central Europe. G3E carries a spectrometer system that collects sunlight backscattered from the Earth's surface and atmosphere in the near-infrared (NIR) and shortwave-infrared (SWIR) spectral range. Solar absorption spectra allow for spatiotemporally dense observations of the column-average concentrations of carbon dioxide (

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Butz, A., J. Orphal, R. Checa-Garcia, et al. "Geostationary Emission Explorer for Europe (G3E): mission concept and initial performance assessment." Atmospheric Measurement Techniques Discussions 8, no. 7 (2015): 6949–91. http://dx.doi.org/10.5194/amtd-8-6949-2015.

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Abstract. The Geostationary Emission Explorer for Europe (G3E) is a concept for a geostationary satellite sounder that targets at constraining the sources and sinks of the greenhouse gases carbon dioxide (CO2) and methane (CH4) for continental-scale regions. Thereby, its primary focus is on Central Europe. G3E carries a spectrometer system that collects sunlight backscattered from the Earth's surface and atmosphere in the near-infrared (NIR) and shortwave-infrared (SWIR) spectral range. Solar absorption spectra allow for spatiotemporally dense observations of the column-average concentrations

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Antunes, P. A., C. J. L. Constantino, R. Aroca, and J. Duff. "Reflection Absorption Infrared Spectra of Thin Solid Films. Molecular Orientation and Film Structure." Applied Spectroscopy 55, no. 10 (2001): 1341–46. http://dx.doi.org/10.1366/0003702011953450.

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The calculated and observed vibrational spectra of a new series of perylene tetracarboxylic derivatives (PTCDs) with different alkyl lateral chain lengths (5, 10, 15, and 20 C) are reported. With the use of characteristic vibrational modes, the question about the degree of molecular organization and packing in these PTCD evaporated films has been resolved by using transmission and reflection-absorption infrared spectroscopy (RAIRS) techniques. From vibrational analysis, it was extracted that the molecules are preferentially oriented with the PTCD moiety head on the surface substrate. The molec

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Sepúlveda, E., M. Schneider, F. Hase, et al. "Long-term validation of tropospheric column-averaged CH<sub>4</sub> mole fractions obtained by mid-infrared ground-based FTIR spectrometry." Atmospheric Measurement Techniques 5, no. 6 (2012): 1425–41. http://dx.doi.org/10.5194/amt-5-1425-2012.

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Abstract. At the Izaña Atmospheric Research Center, high-resolution mid-infrared solar absorption spectra have been recorded for more than 12 yr using Fourier Transform InfraRed (FTIR) spectrometers. We use the spectral fitting algorithm PROFFIT to retrieve long-term time series of methane (CH4) from the measured spectra. We investigate the total column-averaged dry air mole fractions of methane (totXCH4) obtained from a profile scaling and a profile retrieval, and apply two approaches for deriving the tropospheric column-averaged dry air mole fractions: firstly, we use the FTIR hydrogen fluor

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Waxman, Eleanor M., Kevin C. Cossel, Gar-Wing Truong, et al. "Intercomparison of open-path trace gas measurements with two dual-frequency-comb spectrometers." Atmospheric Measurement Techniques 10, no. 9 (2017): 3295–311. http://dx.doi.org/10.5194/amt-10-3295-2017.

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Abstract. We present the first quantitative intercomparison between two open-path dual-comb spectroscopy (DCS) instruments which were operated across adjacent 2 km open-air paths over a 2-week period. We used DCS to measure the atmospheric absorption spectrum in the near infrared from 6023 to 6376 cm−1 (1568 to 1660 nm), corresponding to a 355 cm−1 bandwidth, at 0.0067 cm−1 sample spacing. The measured absorption spectra agree with each other to within 5 × 10−4 in absorbance without any external calibration of either instrument. The absorption spectra are fit to retrieve path-integrated concen

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Wangler, M., D. A. Roth, G. Winnewisser, I. Pak, and A. R. McKellar. "Diode laser spectroscopy of the weakly bound complex NeCH4." Canadian Journal of Physics 79, no. 2-3 (2001): 423–34. http://dx.doi.org/10.1139/p00-081.

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The infrared absorption spectrum of the weakly bound rare-gasspherical-top complex NeCH4 was discovered and analyzed for the first time. Measurements were made with tunable diode laser spectrometers using a pulsed supersonic jet and a long-path low-temperature absorption cell. Close to the R(0) transition of the methane ν4 fundamental band at 1311.430 cm1, the NeCH4 spectrum was recorded as a very compact absorption pattern. Within a total wave-number range of about 0.1 cm1, P-, Q-, and R-branches are located. As the first step, the NeCH4 spectrum was recorded and analyzed in a supersoni

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Galli, A., A. Butz, R. A. Scheepmaker, et al. "CH<sub>4</sub>, CO, and H<sub>2</sub>O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements." Atmospheric Measurement Techniques 5, no. 6 (2012): 1387–98. http://dx.doi.org/10.5194/amt-5-1387-2012.

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Abstract. The TROPOspheric Monitoring Instrument (TROPOMI) will be part of ESA's Sentinel-5 Precursor (S5P) satellite platform scheduled for launch in 2015. TROPOMI will monitor methane and carbon monoxide concentrations in the Earth's atmosphere by measuring spectra of back-scattered sunlight in the short-wave infrared (SWIR). S5P will be the first satellite mission to rely uniquely on the spectral window at 4190–4340 cm−1 (2.3 μm) to retrieve CH4 and CO. In this study, we investigated if the absorption features of the three relevant molecules CH4, CO, and H2O are adequately known. To this en

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Galli, A., A. Butz, R. A. Scheepmaker, et al. "CH<sub>4</sub>, CO, and H<sub>2</sub>O spectroscopy for the Sentinel-5 Precursor mission: an assessment with the Total Carbon Column Observing Network measurements." Atmospheric Measurement Techniques Discussions 5, no. 2 (2012): 2131–67. http://dx.doi.org/10.5194/amtd-5-2131-2012.

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Abstract. The TROPOspheric Monitoring Instrument (TROPOMI) will be part of ESA's Sentinel-5 Precursor (S5P) satellite platform scheduled for launch in 2015. TROPOMI will monitor methane and carbon monoxide concentrations in the Earth's atmosphere by measuring spectra of back-scattered sunlight in the short-wave infrared (SWIR). S5P will be the first satellite mission to rely uniquely on the spectral window at 4190–4340 cm−1 (2.3 μm) to retrieve CH4 and CO. In this study, we investigated if the absorption features of the three relevant molecules CH4, CO, and H2O are adequately known. To this en

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Gao, Wei, Wei-Dong Chen, Wei-Jun Zhang, Yi-Qian Yuan та Xiao-Ming Gao. "Low temperature laser absorption spectra of methane in the near-infrared at 1.65 μm for lower state energy determination". Chinese Physics B 21, № 1 (2012): 014211. http://dx.doi.org/10.1088/1674-1056/21/1/014211.

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Bader, W., T. Stavrakou, J. F. Muller, et al. "Long-term evolution and seasonal modulation of methanol above Jungfraujoch (46.5° N, 8.0° E): optimisation of the retrieval strategy, comparison with model simulations and independent observations." Atmospheric Measurement Techniques 7, no. 11 (2014): 3861–72. http://dx.doi.org/10.5194/amt-7-3861-2014.

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Abstract. Methanol (CH3OH) is the second most abundant organic compound in the Earth's atmosphere after methane. In this study, we present the first long-term time series of methanol total, lower tropospheric and upper tropospheric–lower stratospheric partial columns derived from the analysis of high resolution Fourier transform infrared solar spectra recorded at the Jungfraujoch station (46.5° N, 3580 m a.s.l.). The retrieval of methanol is very challenging due to strong absorptions of ozone in the region of the selected υ8 band of CH3OH. Two wide spectral intervals have been defined and adju

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Yirdaw Berhe, Temesgen, Gizaw Mengistu Tsidu, Thomas Blumenstock, Frank Hase, and Gabriele P. Stiller. "Methane and nitrous oxide from ground-based FTIR at Addis Ababa: observations, error analysis, and comparison with satellite data." Atmospheric Measurement Techniques 13, no. 7 (2020): 4079–96. http://dx.doi.org/10.5194/amt-13-4079-2020.

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Abstract. A ground-based, high-spectral-resolution Fourier transform infrared (FTIR) spectrometer has been operational in Addis Ababa, Ethiopia (9.01∘ N latitude, 38.76∘ E longitude; 2443 m altitude above sea level), since May 2009 to obtain information on column abundances and profiles of various constituents in the atmosphere. Vertical profile and column abundances of methane and nitrous oxide are derived from solar absorption measurements taken by FTIR for a period that covers May 2009 to March 2013 using the retrieval code PROFFIT (V9.5). A detailed error analysis of CH4 and N2O retrieval

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Frankenberg, C., T. Warneke, A. Butz та ін. "Pressure broadening in the 2ν<sub>3</sub> band of methane and its implication on atmospheric retrievals". Atmospheric Chemistry and Physics 8, № 17 (2008): 5061–75. http://dx.doi.org/10.5194/acp-8-5061-2008.

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Abstract. N2-broadened half widths and pressure shifts were obtained for transitions in the 2ν3 methane band. Laboratory measurements recorded at 0.011 cm−1 resolution with a Bruker 120 HR Fouriertransform spectrometer were analysed from 5860 to 6185 cm−1. A 140 cm gas cell was filled with methane at room temperature and N2 as foreign gas at pressures ranging from 125 to 900 hPa. A multispectrum nonlinear constrained least squares approach based on Optimal Estimation was applied to derive the spectroscopic parameters by simultaneously fitting laboratory spectra at different ambient pressures a

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Garcia, Francisco X., Lola De Lima, and Julio C. Medina. "Determination of Methanol and Methyl tert-Butyl Ether in Gasoline by Infrared Spectroscopy Using the CIRCLE® Cell and Multivariate Calibration." Applied Spectroscopy 47, no. 7 (1993): 1036–39. http://dx.doi.org/10.1366/0003702934415381.

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The feasibility of predicting concentrations of methanol and methyl tert-butyl ether (MTBE) in gasolines from the mid-infrared absorption spectra was investigated. The C-O bond stretching band region was related to these oxygenated compounds' levels with the aid of multivariate statistics. The sample spectra were taken with the use of a circular internal reflectance (CIRCLE®) cell. With the use of partial least-squares (PLS) regression a model with 18 samples was built and used to predict a set of 10 gasolines with good agreement. Two additional samples prepared with other brands of gasoline w

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Baines, Kevin H., Robert A. West, Lawrence P. Giver, and Fernando Moreno. "Quasi-random narrow-band model fits to near-infrared low-temperature laboratory methane spectra and derived exponential-sum absorption coefficients." Journal of Geophysical Research: Planets 98, E3 (1993): 5517–29. http://dx.doi.org/10.1029/92je02808.

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Xiao, Chunlei, Bihong Fu, Hanqing Shui, Zhaocheng Guo, and Jurui Zhu. "Detecting the Sources of Methane Emission from Oil Shale Mining and Processing Using Airborne Hyperspectral Data." Remote Sensing 12, no. 3 (2020): 537. http://dx.doi.org/10.3390/rs12030537.

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Methane (CH4) is one of important greenhouse gases that affects the global radiative balance after carbon dioxide (CO2). Previous studies have demonstrated the detection of known sources of CH4 emission using the hyperspectral technology based on in situ vertical CH4 profile or ground CH4 emissions data. However, those approaches have not yet to detect the unknown terrestrial sources of CH4 emission at local-scale or regional-scale. In this paper, the Shortwave Airborne Spectrographic Imager (SASI) was employed to detect concentrated sources of CH4 emissions based on the absorption of CH4 in t

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Gerilowski, K., A. Tretner, T. Krings, et al. "MAMAP – a new spectrometer system for column-averaged methane and carbon dioxide observations from aircraft: instrument description and performance assessment." Atmospheric Measurement Techniques Discussions 3, no. 4 (2010): 3199–276. http://dx.doi.org/10.5194/amtd-3-3199-2010.

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Abstract. Carbon dioxide (CO2) and Methane (CH4) are the two most important anthropogenic greenhouse gases. CH4 is furthermore one of the most potent present and future contributors to global warming because of its large global warming potential (GWP). Our knowledge of CH4 sources and sinks is based primarily on sparse in-situ local point measurements from micro sites and surface networks and more recently on low spatial resolution satellite observations. There is a need for measurements of the dry columns of CO2 and CH4 having high spatial resolution and spatial coverage. In order to fill thi

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