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Dissertations / Theses on the topic 'Far-infrared spectra'

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Published: 3 June 2025
Last updated: 31 July 2025

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1

Hietanen, Jorma. "Investigations on far infrared spectra of acetylenes." Oulu : University of Oulu, 1986. http://catalog.hathitrust.org/api/volumes/oclc/15356036.html.

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2

Wishnow, Edward Hyman. "Far-infrared absorption by liquid nitrogen and liquid oxygen." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25072.

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This thesis examines the collision induced, far-infrared absorption of homonuclear diatomic molecules. These molecular processes are relevant in the astrophysical environments of planetary atmospheres and galactic molecular clouds, and a brief survey of far-infrared measurements of these regions is presented. The theory of collision induced absorption by molecular rotational transitions is reviewed and a calculation is made of the quadrupolar induced, single rotational transition absorption line intensities of the nitrogen and oxygen molecules. The far-infrared absorption spectra of liquid nit
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3

Lee, Sung-Ik. "Far-infrared absorption of small metallic particles /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487261919113037.

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4

Jolma, Kalevi. "High resolution far infrared spectra of certain light linear three and four atomic molecules." Oulu : University of Oulu, 1985. http://catalog.hathitrust.org/api/volumes/oclc/15465428.html.

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5

Humpage, Neil. "Observing and modelling the impact of arctic and tropical cirrus clouds on far-infrared radiance spectra." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5652.

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The work described in this thesis concerns the effect of cirrus clouds on far-infrared (FIR) radiance spectra. Though the importance of both FIR radiation and cirrus clouds to the Earth’s energy budget is well recognised, few high spectral resolution measurements have been made at FIR wavelengths to date. Observations taken during two diverse field campaigns, along with spectra simulated using a radiative transfer model, are used here to investi- gate the FIR signature of cirrus. The FIR observations presented are made using the TAFTS spectrometer, which measures spectral radiances from ei- th
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6

Kharroubi, Hassane. "Étude du pouvoir réflecteur de monocristaux uniaxes et biaxes dans l'infrarouge lointain." Nancy 1, 1994. http://www.theses.fr/1994NAN10108.

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L'étude du pouvoir réflecteur (r) et de la transmission (t) des milieux anisotropes et absorbants dans l'infrarouge lointain nous a conduit a présenter des expressions directement programmables des relations permettant la détermination des constantes optiques, l'indice de réfraction n et l'indice d'absorption k à partir des mesures expérimentales de r et de t. Nous avons établi les expressions des facteurs de réflexion et de transmission pour les deux polarisations possibles de l'onde, en fonction de l'angle d'incidence. L'étude est limitée au cas de la propagation d'une onde plane dans les pl
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7

Homes, Christopher C. "The far-infrared powder absorption spectra of bis-tetramethyltetraselenafulvalene salts [(TMTSF)₂X, X=(PF₆, AsF₆, SbF₆, BF₄, ClO₄ and ReO₄)]." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25891.

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The far-infrared powder absorption spectra from 20-250 cm⁻¹ have been examined in a series of six protonated and deuterated (TMTSF)₂X compounds, with X=PF₆, AsF₆ and SbF₆ (octahedral anions) and X=BF₄, ClO₄ and ReO₄ (tetrahedral anions) as a function of temperature from 10K to 290K . The octahedral-anion spectra are all very similar, having 4 sharp resonances which have been attributed to three lattice modes and one internal mode. These assignments were made on the basis of isotope shifts upon deuteration, and wave number temperature dependence. The intensity of the lines is roughly proportion
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8

Magnani, Federico. "Analysis of aircraft cirrus clouds spectral measurements." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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In questa tesi vengono descritte le proprietà dell’atmosfera terrestre nel lontano infrarosso (FIR) e il loro impatto climatico. Negli ultimi anni sempre più attenzione è stata posta nella ricerca in questo campo e sono stati sviluppati strumenti e metodi di analisi innovativi, come dimostrato dalla nascita della missione Far-infrared-Outgoing-Radiation Understanding and Monitoring (FORUM) che propone il lancio di un satellite attrezzato con strumenti FIR. Quasi il 45% dell’energia emessa dal pianeta è portata da onde nel FIR, attraverso il meccanismo del trasferimento radiativo: poichè l’atmo
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9

Fox, Cathryn. "Far-infrared spectral radiance studies : application to water vapour and cirrus." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/25752.

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This thesis presents the analysis of high-resolution spectral radiances recorded using the Imperial College Tropospheric Airborne Fourier Transform Spectrometer (TAFTS) instrument, which uniquely has the ability to record high resolution in-situ measurements, both up-welling and down-welling, in the far-infrared spectral region 80-800cm-1. The TAFTS data used in this work has been recorded during two diverse field campaigns, one ground-based, and one onboard the Facility for Airborne Atmospheric Measurements (FAAM) BAe-146 research aircraft. The far-infrared spectral region has been shown to h
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10

Juanola-Parramon, R. "A far-infrared spectro-spatial space interferometer : instrument simulator and testbed implementation." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1427371/.

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FIRI (Far Infrared Interferometer) is a concept for a spatial and spectral space interferometer with an operating wavelength range 25-300 μm and sub-arcsecond angular resolution, and is based on the combination of two well-known techniques, Stellar Interferometry and Fourier Transform Spectroscopy, to achieve high spectral and spatial resolution in the Far Infrared (Chapter 2). The resulting technique is called Double Fourier Spatio-Spectral Interferometry (Mariotti and Ridgway 1988). With increased spatial and spectral resolution a number of interesting science cases such as the formation and
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11

Cossich, Marcial de Farias William <1987&gt. "Analysis of far-infrared (FIR) high spectral resolution data for cloud studies." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9487/1/Tesi_WilliamCossich.pdf.

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The Far-Infrared Outgoing Radiation Understanding and Monitoring (FORUM) mission has recently been selected by the European Satellite Agency (ESA) as 9 th Earth Explorer mission. FORUM mission aims at studying the water vapor and clouds by filling the long-standing gap in Far-Infrared (FIR) spectral observations from space. In the framework of the FORUM mission, this thesis analyses FIR measurements to characterize the spectral signatures of radiance in presence of ice clouds. At this purpose, a cloud identification and classification code (named CIC) is implemented. CIC is an innovative machi
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12

Taylor, Joseph. "Achieving 0.1 K absolute calibration accuracy for high spectral resolution infrared and far infrared climate benchmark measurements." Doctoral thesis, Université Laval, 2014. http://hdl.handle.net/20.500.11794/25639.

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Mesurer le rayonnement infrarouge de manière résolue spectralement à partir de satellites avec une très haute précision radiométrique constitue un besoin critique pour les futures missions de référence climatique. Pour les spectres de rayonnement infrarouge, il a été déterminé qu'une précision de mesure exprimée comme une erreur de température de brillance inférieure à 0,1 K est nécessaire pour la détection de tendances au-delà de la variabilité naturelle des signatures climatiques sur une décennie. Le “Space Science and Engineering Center” de l'Université du Wisconsin (UW-SSEC), avec le souti
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13

Turner, Emma Catherine. "Evaluating spectral radiances simulated by the HadGEM2 global climate model using longwave satellite measurements." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10047.

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A 'model-to-radiance' comparison of simulated brightness temperatures and radiances from the Hadley Centre Global Environmental Model 2 (HadGEM2-A) with longwave measurements from the High Resolution Infrared Radiation Sounder/4 (HIRS/4) and the Infrared Atmospheric Sounding Interfermeter (IASI) onboard the MetOp-A satellite is presented for all-sky and clear-sky global means. The fast Radiative Transfer model for TOVS 10 (RTTOV-10) is applied to HadGEM2 output to simulate observational-equivalent data. The results are compared with corresponding broadband analyses. A method is developed to ex
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14

O'Rourke, Douglas James Peter. "Spectral modeling of dusty galaxies, and evolution of the far infrared-radio correlation." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610847.

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15

Arosio, Carlo. "Antarctic cloud spectral emission from ground-based measurements, a focus on far infrared signatures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7837/.

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The present work belongs to the PRANA project, the first extensive field campaign of observation of atmospheric emission spectra covering the Far InfraRed spectral region, for more than two years. The principal deployed instrument is REFIR-PAD, a Fourier transform spectrometer used by us to study Antarctic cloud properties. A dataset covering the whole 2013 has been analyzed and, firstly, a selection of good quality spectra is performed, using, as thresholds, radiance values in few chosen spectral regions. These spectra are described in a synthetic way averaging radiances in selected inter
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16

Adamczyk, Aleksandra Katarzyna. "Analysis of the high-resolution ro-vibrational spectrum of DC3N in the far and mid infrared regions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21732/.

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Cyanoacetylene HC3N is a molecule of great astronomical importance and it has been observed in many interstellar environments. Its deuterated form DC3N has been detected in number of sources from external galaxies to Galactic interstellar clouds, star-forming regions and planetary atmospheres. All these detections relied on previous laboratory investigations, which however still lack some essential information concerning its infrared spectrum. In this project, high-resolution ro-vibrational spectra of DC3N have been recorded in two energy regions: 150 – 450 cm-1 and 1800 – 2800 cm-1. In the fi
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17

Mahé, Jérôme. "Far infrared/Tera-Hertz spectroscopy in the gas phase : experiments and theory." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLE043/document.

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La spectroscopie infrarouge permet d’identifier la structure 3D de systèmes moléculaires, par comparaison des spectres mesurés et simulés. Nous travaillons en phase gazeuse, où les molécules et clusters sont libres d’interactions intermoléculaires. Notre travail combine les expériences IR-UV ion-dip et le calcul de spectres IR anharmoniques par la méthode DFT-MD. Le spectre IR est calculé pour les structures 3D de plus basses énergies,le meilleur accord donnant la connaissance de la structure présente dans les conditions expérimentales.Nous démontrons que le domaine de l’IR lointain/THz (&lt;8
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18

Drouhet, Willie. "Study of the Far Infrared Emission of Nearby Spiral Galaxies." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00929963.

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In my PHD work I explored the links between the physical properties of interstellar dust and other components of nearby spiral galaxies especially their stellar content. I worked on 46 disk galaxies from KINGFISH with IRAC/MIPS/PACS/SPIRE maps (3.6 - 500 microns). A bias is usually introduced in estimating disk orientations by using only a single surface brightness isophote. Thus I devised different surface brightness levels separated by constant steps in surface brightness and extracted isophotes at these levels in all FIR maps as well as in all IRAC 4.5 microns maps. To further assess the co
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19

El, Khoury Youssef. "Mid and far infrared spectroelectrochemical studies on the metal−ligand interactions in respiratory chain enzymes." Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/EL_KHOURY_Youssef_2010.pdf.

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La thèse contient trois parties principales, la coordination du Cu, l'inhibition par le Zn, et le lointain infrarouge. Les vibrations de complexes de cuivre ont été étudiées en moyen et lointain infrarouge. Les spectres des complexes Cu- poly-L- histidine ont été enregistrés en fonction du pH en moyen et lointain infrarouge. De même, les vibrations métal- ligand ont été observées dans le lointain infrarouge. La coordination du Cu par l'amyloïde- beta16 est une étape déterminante dans l'apparition de la maladie d'Alzheimer. Les complexes cuivre- amyloïde- beta16 ont été étudiés dans le moyen in
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20

Belfort, Patrick. "Proprietes infrarouges et optiques des galaxies iras : des galaxies normales aux galaxies a flambee." Paris 7, 1987. http://www.theses.fr/1987PA077184.

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Grace au satellite iras, on a decouvert un type de galaxies dont le rapport luminosite infrarouge sur bleue peut atteindre 100 ou plus; ces galaxies qu'on suppose subir des flambees de formation d'etoile sont l'objet de cette these. Un modele photometrique simple a ete construit pour rendre compte des proprietes ir lointain et optique de ces galaxies a flambees. La photometrie ccd d'un certain echantillon de galaxies iras a ete realisee pour tester le modele: l'accord modele-observation est satisfaisant et la force, ainsi que l'extinction des flambees ont pu etre estimees
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21

Wang, Xiaojun. "The N2-broadened far infrared spectrum of water vapour." 1994. http://hdl.handle.net/1993/18606.

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22

Tolbert, William Alden Blossom. "Spectral and temporal dynamics of far infrared generated phonons in LaF₃." 1990. http://catalog.hathitrust.org/api/volumes/oclc/23380616.html.

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23

Wishnow, Edward H. "The far-infrared absorption spectrum of low temperature hydrogen gas." Thesis, 1993. http://hdl.handle.net/2429/2047.

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The far-infrared absorption spectrum of normal hydrogen gas has been measured from 20-320 cm' (A=500-31 pm), over the temperature range 21-38 K, and the pressure range0.6-3 atmospheres. The spectra cover the very weak and broad collision-induced translational absorption band of 112 which at these low temperatures is observed well isolated from the 112 rotational lines. Translational absorption occurs when two molecules collide and absorb a photon via a transient induced dipole moment. The molecules emerge from the collision with altered translational energies, and the rotational, vibrational,
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24

Yang, Jheng-Hong, and 楊政紘. "Research on far infrared spectrum and phonon density of states of GaAs and InP." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/10511565567749542156.

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碩士<br>國立交通大學<br>電子工程學系 電子研究所<br>102<br>We measured and analyzed the far infrared spectra of two typical III-V semiconductors, GaAs and InP. The measurement was performed by an FTIR at room temperature. Observed features other than the Reststrahlen-band were assigned critical points associated with specific two-phonon combinations, according to the strength, position, and shape of two-phonon densities of states which were calculated by the 11-parameter rigid-ion model and the special-k point method. The critical points are related to van Hove singularities of the density-of-states spectra. We l
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25

Vaillancourt, John E. "The far-infrared/submillimeter polarization spectrum of molecular clouds and analysis based on temperature maps of Orion /." 2001. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3019986.

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