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Journal articles on the topic 'Spectral transition'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 July 2025

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1

Ding, Nan, Qiusheng Gu, Yunyong Tang, Xiongfei Geng, Yongyun Chen, and Xiaotong Guo. "A Special State Transition in the Blazar OT 081: Implication for the Unified State Transition Paradigm of Different-scale Black Hole Systems." Astrophysical Journal 944, no. 1 (2023): 12. http://dx.doi.org/10.3847/1538-4357/acae97.

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Abstract Exploring the similar behavior of black hole systems with different scales will provide insight into the unified physical laws of black hole systems. Here, we report a special spectral state transition process in blazar OT 081, which is driven by a supermassive black hole. Based on the X-ray flux versus photon index distribution, stacked average X-ray spectra, L 2500Å − α ox parameters, and broadband spectral energy distributions, we conducted a pilot study on the spectral state transition for this blazar system. The analysis results suggest that the source transitions through a stead

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Uddin, Zaheer, Muhammad Kaleem, Saba Javaid, and Roohi Zafar. "Transition Probabilities, Oscillator and Line Strengths in Sc XIX." East European Journal of Physics, no. 2 (June 1, 2024): 111–20. http://dx.doi.org/10.26565/2312-4334-2024-2-09.

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Scandium XIX ion is a member of the isoelectronic sequence of Li-like ions. Numerical coulomb approximation and quantum defect theory have been used to calculate energies, quantum defects & transition probabilities, oscillator, and line strengths of Sc XIX ion for the transitions ns → mp, np → ms, np → md, and nd → mp Rydberg series. The energies of Sc XIXX ions up to n = 5 are given in the NIST database and the literature. We used quantum defect theory and determined the energies and quantum defects up to n = 30. The energies and quantum defects of 125 levels are reported for the first ti

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Yuan, Bo, Koichi Murayama, and Huiming Yan. "Study of Thermal Dynamics of Defatted Bovine Serum Albumin in D2O Solution by Fourier Transform Infrared Spectra and Evolving Factor Analysis." Applied Spectroscopy 61, no. 9 (2007): 921–27. http://dx.doi.org/10.1366/000370207781745919.

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Fourier transform infrared (FT-IR) spectra have been measured for defatted bovine serum albumin (BSA) in D2O with a concentration of 2.0 wt % over a temperature range of 26–90 °C and the corresponding difference spectra have been calculated by subtracting the contribution of D2O at the same temperature. Evolving factor analysis (EFA) by selecting two factors and three factors has been employed to analyze the temperature-dependent difference IR spectra in the 1700–1600 cm−1 spectral region of the defatted BSA in D2O solution. Three-factor EFA has been employed to determine the distinction of th

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Крылов, А. С., А. Н. Втюрин, В. Н. Воронов та С. Н. Крылова. "Проявление структурных фазовых переходов в кристалле Rb-=SUB=-2-=/SUB=-KLuF-=SUB=-6-=/SUB=- в спектрах комбинационного рассеяния света". Журнал технической физики 126, № 4 (2019): 423. http://dx.doi.org/10.21883/os.2019.04.47510.301-18.

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AbstractThe Raman spectra of an Rb_2KLuF_6 crystal are studied in the temperature range from 8 to 375 K, which includes two phase transitions: one of which proceeds from a cubic to a tetragonal phase, while the other transition takes place from a tetragonal to a monoclinic phase. An analysis of the temperature dependences of parameters of spectral lines shows that the former transition is of the second kind, while the latter transition is of the first kind, close to the tricritical point. It is shown that the structural phase transitions in the Rb_2KLuF_6 double perovskite are not associated w

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5

Sang, Cuicui, Feng Chen, Chao Chen та Bingcong Gou. "Kα transition probabilities of C-like to F-like Al ions". Canadian Journal of Physics 93, № 3 (2015): 267–70. http://dx.doi.org/10.1139/cjp-2014-0135.

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Kα radiative transitions of C-like to F-like Al ions are studied using the multiconfiguration Dirac–Fock (MCDF) method. The fully relativistic MCDF approach was specifically designed to calculate atomic structures and radiative transition rates, and hence it ensures a reasonable description of the emission effects and spectral intensities. The energies and wavefunctions, corresponding mixing coefficients, the influence of electron correlation effects on energy levels, and radiative transition rates for C-like to F-like Al ions are investigated in detail. Good agreement is found between the cal

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6

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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7

Zhang, Hua, Xin Wang, and Haochen Yuan. "Effects of Waves on the Spectral Anisotropy of the Transition Range in Solar Wind Turbulence." Astrophysical Journal 985, no. 1 (2025): 56. https://doi.org/10.3847/1538-4357/adc9a8.

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Abstract In the transition range of the solar wind turbulence, the magnetic spectrum has been observed to be strongly anisotropic with respect to the local mean field. However, the generation mechanism of the anisotropy remains not well understood. There are two typical types of waves existing in the transition range, including ion cyclotron waves (ICWs) and kinetic Alfvén waves (KAWs) propagating in the directions parallel and perpendicular to the magnetic field, respectively. In this work, we perform a statistical study about the effects of the waves on the spectral anisotropy of the transit

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8

Michalenko, Joshua J., Christopher M. Murzyn, Joshua D. Zollweg, Lydia Wermer, Alan J. Van Omen, and Michael D. Clemenson. "Machine Learning Predictions of Transition Probabilities in Atomic Spectra." Atoms 9, no. 1 (2021): 2. http://dx.doi.org/10.3390/atoms9010002.

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Forward modeling of optical spectra with absolute radiometric intensities requires knowledge of the individual transition probabilities for every transition in the spectrum. In many cases, these transition probabilities, or Einstein A-coefficients, quickly become practically impossible to obtain through either theoretical or experimental methods. Complicated electronic orbitals with higher order effects will reduce the accuracy of theoretical models. Experimental measurements can be prohibitively expensive and are rarely comprehensive due to physical constraints and sheer volume of required me

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9

Bury, T. M., C. T. Bauch, and M. Anand. "Detecting and distinguishing tipping points using spectral early warning signals." Journal of The Royal Society Interface 17, no. 170 (2020): 20200482. http://dx.doi.org/10.1098/rsif.2020.0482.

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Theory and observation tell us that many complex systems exhibit tipping points—thresholds involving an abrupt and irreversible transition to a contrasting dynamical regime. Such events are commonly referred to as critical transitions. Current research seeks to develop early warning signals (EWS) of critical transitions that could help prevent undesirable events such as ecosystem collapse. However, conventional EWS do not indicate the type of transition, since they are based on the generic phenomena of critical slowing down. For instance, they may fail to distinguish the onset of oscillations

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10

Ward, Jacob W., Jacqueline J. Li, Jared Schwartz, Gillian Nave, Ton A. J. J. Raassen, and Peter H. M. Uylings. "Branching Fractions and Transition Probabilities for UV Transitions in the Spectrum of Cr ii." Astrophysical Journal 959, no. 1 (2023): 8. http://dx.doi.org/10.3847/1538-4357/acfafe.

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Abstract We present transition probabilities for 268 spectral lines of singly ionized chromium (Cr ii) in the wavelength region 208–414 nm. Branching fractions were measured in archival Fourier transform spectra of chromium-argon and chromium-neon hollow cathode lamps and a Penning discharge source. The branching fractions were combined with previously published experimental lifetimes of 14 levels, and with lifetimes from semiempirical calculations for 14 levels to give transition probabilities. The estimated uncertainties of the transition probabilities range from 10% to 26%. A comparison wit

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11

Do, Thanh Nhut, Cheng Zhang, Xuanwei Ong, Jie Lian, Yinthai Chan, and Howe-Siang Tan. "Measuring the Ultrafast Spectral Diffusion Dynamics of Colloidal CdSe Nanomaterials." MRS Advances 4, no. 1 (2019): 1–7. http://dx.doi.org/10.1557/adv.2019.38.

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AbstractWe use ultrafast coherent two-dimensional electronic spectroscopy (2DES) to study the ultrafast spectral diffusion dynamics of colloidal CdSe quantum dots (QDs) and CdSe nanoplatelets (NPLs). The Center Line Slope (CLS) and Nodal Line Slope (NLS) techniques were employed to analyse the 2DES spectra. We show that no spectral diffusion dynamics occurs for the CdSe QDs. On the other hand, spectral diffusion was observed in the CdSe 5 mono-layers NPLs heavy-hole transition. The normalized Frequency Fluctuation Correlation Function (FFCF) of the CdSe NPLs heavy-hole transition was measured

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12

Chisham, G., and M. P. Freeman. "An investigation of latitudinal transitions in the SuperDARN Doppler spectral width parameter at different magnetic local times." Annales Geophysicae 22, no. 4 (2004): 1187–202. http://dx.doi.org/10.5194/angeo-22-1187-2004.

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Abstract. Latitudinal transitions from low to high Doppler spectral width in backscatter measured by the Super Dual Auroral Radar Network (SuperDARN) are now routinely used as proxies for the polar cap boundary (PCB) in the cusp-region ionosphere. In this paper we perform a statistical study of the nature of similar spectral width transitions at other magnetic local times (MLTs). This analysis illustrates that these latitudinal spectral width transitions exist at all magnetic local times, and that the latitude, gradient, and amplitude of the transitions vary systematically with MLT. In particu

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13

Klimin S. A., Kuznetsova E. S., and Berdonosov P. S. "37-21." Optics and Spectroscopy 132, no. 1 (2022): 34. http://dx.doi.org/10.21883/eos.2022.01.52985.37-21.

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The transmission spectra of a 2D frustrated magnet Cu3Sm(SeO3)2O2Cl have been measured in the region of f-f transitions of the Sm3+ ion in a wide temperature range (4-300 K). The energies of 40 crystal-field levels of the Sm3+ ion have been determined for the ground and excited multiplets in the spectral range 2000 – 10000 cm-1. In the spectra two magnetic phase transitions were registered: at a temperature TN = 35 К, magnetic ordering occurs, and at a temperature of TR = 8.5 К, a spin-reorientation transition occurs. The ground Kramers doublet of the Sm3+ ion is split only at a low-temperatur

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14

Shang, Xue, Chunxiao Zhou, Bolin Liu, Naosheng Qiao, and Binfang Cao. "Experimental Branching Fractions, Transition Probabilities, and Oscillator Strengths of La ii." Astrophysical Journal Supplement Series 278, no. 1 (2025): 21. https://doi.org/10.3847/1538-4365/adc927.

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Abstract Branching fractions of 86 La ii lines in the spectral range of 243.340–626.229 nm have been measured using a grating spectrometer based on the emission spectra of a lanthanum hollow cathode lamp. Combining these branching fractions with previously measured radiative lifetimes using the time-resolved laser-induced fluorescence technique, transition probabilities and oscillator strengths were determined for 86 lines belonging to transitions 5d 2–4f5d, 5d6s–4f5d, 4f6s–5d7s, 4f5d–5d7s, 5d6p–5d7s, 4f6s–5d6d, 4f5d–5d6d, 5d6p–5d6d, 6s6p–5d6d, 4f5d–4f 2, and 5d6p–4f 2. These fundamental atomi

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15

White, Elgiva, Gerry O’Sullivan, and Padraig Dunne. "Soft x-ray spectra of cerium laser-produced plasmas." Journal of Physics B: Atomic, Molecular and Optical Physics 54, no. 23 (2021): 235701. http://dx.doi.org/10.1088/1361-6455/ac42da.

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Abstract Spectra of laser-produced plasmas of cerium have been recorded in the 1.5 to 15.5 nm spectral region. The plasmas were formed using the frequency doubled pulsed output of a neodymium-doped yttrium aluminium garnet (Nd:YAG) laser at 532 nm. At the power densities incident on-target, ranging from 8.6 × 109–2.1 × 1013 W cm−2, Ce4+ to Ce27+ ions gave rise to emission from Δn = 0, 1 transitions to final states where n = 4. The spectra are dominated by an intense unresolved transition array (UTA) in the 8–10 nm region arising from n = 4 to n = 4 transitions. Two distinct components of this

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16

Boldyrev, Kirill N., Anastasiia D. Molchanova, Alexey R. Nurmukhametov, Mikhail V. Eremin, Roman V. Pisarev, and Marina N. Popova. "Nonreciprocity of Optical Absorption in the Magnetoelectric Antiferromagnet CuB2O4." Magnetochemistry 9, no. 4 (2023): 95. http://dx.doi.org/10.3390/magnetochemistry9040095.

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The change in the absorption spectra due to reversal of the direction of light propagation (nonreciprocity of absorption) is a consequence of a simultaneous violation of both time-reversal and spatial-inversion symmetries. Here, we report on a high-resolution spectroscopic study of absorption nonreciprocity in the noncentrosymmetric multiferroic CuB2O4 below the antiferromagnetic transition temperature TN = 21 K in the commensurate phase in magnetic fields up to 0.5 T. The study was performed in a broad spectral region covering several exciton transitions, which all are followed by an anomalou

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17

Parkinson, M. L., K. M. Hannah, and P. L. Dyson. "Complexity in the high latitude HF radar spectral width boundary region." Annales Geophysicae 26, no. 4 (2008): 877–92. http://dx.doi.org/10.5194/angeo-26-877-2008.

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Abstract. SuperDARN radars are sensitive to the collective Doppler characteristics of decametre-scale irregularities in the high latitude ionosphere. The radars routinely observe a distinct transition from large spectral width (>100 m s−1) located at higher latitudes to low spectral width (<50 m s−1) located at lower latitudes. Because of its equatorward location, the TIGER Tasmanian radar is very sensitive to the detection of the spectral width boundary (SWB) in the nightside auroral ionosphere. An analysis of the line-of-sight velocities and 2-D beam-swinging vectors suggests the meso-

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18

Krylosv A. S., Vtyurin A. N., Gudim I. A., Nemtsev I. V., and Krylova S. N. "38-21." Optics and Spectroscopy 132, no. 1 (2022): 78. http://dx.doi.org/10.21883/eos.2022.01.52990.38-21.

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The Raman spectra of four crystals of TbFe3-хGax (BO3) 4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed

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Крылов, А. С., А. Н. Втюрин, И. А. Гудим, И. В. Немцев та С. Н. Крылова. "Фазовая диаграмма и особенности поведения мягких мод в твердых растворах со структурой хантита TbFe-=SUB=-3-x-=/SUB=-Ga-=SUB=-x-=/SUB=-(BO_3)-=SUB=-4-=/SUB=-". Оптика и спектроскопия 130, № 1 (2022): 84. http://dx.doi.org/10.21883/os.2022.01.51893.38-21.

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The Raman spectra of four crystals of TbFe3-хGax (BO3) 4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed

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20

Сухачев, А. Л., А. В. Малаховский, C. S. Nelson, И. А. Гудим та В. Л. Темеров. "Сравнение спектров поглощения ионов Nd-=SUP=-3+-=/SUP=- в кристаллах NdFe-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-, Nd-=SUB=-0.5-=/SUB=-Gd-=SUB=-0.5-=/SUB=-Fe-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=- и Ho-=SUB=-0.75-=/SUB=-Nd-=SUB=-0.25-=/SUB=-Fe-=SUB=-3-=/SUB=-(BO-=SUB=-3-=/SUB=-)-=SUB=-4-=/SUB=-". Физика твердого тела 63, № 1 (2021): 111. http://dx.doi.org/10.21883/ftt.2021.01.50408.182.

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Polarized optical absorption spectra in the range of some f-f transitions of Nd3+ ions in Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4 and NdFe3(BO3)4 crystals were compared at 90 K. Spectral features related to difference of local environment of Nd3+ ions in the mentioned crystals were revealed. In the range of 4I9/2 → 4G5/2 + 2G7/2 transition of Nd3+ ions in Ho0.75Nd0.25Fe3(BO3)4 crystal the appearance of some absorption lines owing to the change of the local symmetry during structural transition R32 → P3121 at ~ 200 K was revealed. Their intensity increases smoothly, when the temperature decr

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21

Greenbaum, Lior, Debby Schwartz, and Zvi Malik. "Spectrally Resolved Microscopy of GFP Trafficking." Journal of Histochemistry & Cytochemistry 50, no. 9 (2002): 1205–12. http://dx.doi.org/10.1177/002215540205000907.

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Folding and chromophore cyclization-oxidation processes of green and cyan fluorescent fusion proteins (GFP and CFP) in subcellular microenvironments of transfected C6 glioma cells were studied by multipixel spectrally resolved microscopy (SRM). Discrete time-dependent spectral transitions were characterized during protein folding and chromophore maturation in the cytosol, nucleus, mitochondria, endoplasmic reticulum (ER), and Golgi. Spectral similarity mapping of fluorophore transition phases demarcated spatiotemporal fluorescence correlation at a subcellular level. Folding stages were charact

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22

Mavroyannis, Constantine. "A laser-excited three-level atom. II numerical results." Canadian Journal of Physics 68, no. 4-5 (1990): 411–21. http://dx.doi.org/10.1139/p90-065.

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Numerical calculations are presented for the interference spectra of a laser-excited three-level atom, where the strong and the weak atomic transitions are driven by resonant and nonresonant laser fields, respectively. The spectral functions describing the interference spectra for the electric dipole allowed excited state have been considered in the low- and high-intensity limit of the laser field operating in the strong transition. The interference spectra arise from the competition between short-lifetime spontaneous processes and short- and long-lifetime excitations induced by the strong and

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Yadykova, Anastasiya Y., Larisa A. Strelets, and Sergey O. Ilyin. "Infrared Spectral Classification of Natural Bitumens for Their Rheological and Thermophysical Characterization." Molecules 28, no. 5 (2023): 2065. http://dx.doi.org/10.3390/molecules28052065.

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Natural bitumens consist of many molecules whose chemical composition depends on the oilfield and determines the physicochemical properties of the bitumens as materials. Infrared (IR) spectroscopy is the fastest and least expensive method to assess the chemical structure of organic molecules, which makes it attractive in terms of rapid prediction of the properties of natural bitumens based on their composition evaluated in this way. In this work, IR spectra were measured for ten samples of natural bitumens significantly different in properties and origin. Based on the ratios of certain IR abso

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24

Ferrara, C., M. Giarrusso, and F. Leone. "Experimental atomic data of spectral lines – I. Cs, Ba, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Re, and Os in the 370–1000 nm interval." Monthly Notices of the Royal Astronomical Society 527, no. 3 (2023): 4440–66. http://dx.doi.org/10.1093/mnras/stad3230.

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ABSTRACT Atomic data are fundamental for plasma diagnostics in laboratory and astrophysics through spectroscopy. These data are extensively present in data bases for light elements, however incomplete for high-mass atoms. This paper presents the results of systematic spectroscopy of 17 elements with high Z, expected to be produced in kilonova events generated by neutron star mergers, whose spectral lines are not yet fully identified in stellar spectra and fusion devices. Experimental data are from échelle high-resolution (λ/Δλ = 60 000) spectroscopy of hollow cathode lamps obtained with the Ca

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Kramida, A., and K. Haris. "Critically Evaluated Spectral Data for Singly Ionized Carbon (C ii)." Astrophysical Journal Supplement Series 260, no. 1 (2022): 11. http://dx.doi.org/10.3847/1538-4365/ac5401.

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Abstract All available experimental data on the spectrum of singly ionized carbon have been critically analyzed. Measurement uncertainties of all published studies have been reassessed. The scope of observational data includes laboratory emission spectra of arcs, sparks, electrodeless discharges, and hollow cathode lamps recorded with grating and Fourier transform spectrometers, laboratory photoabsorption spectra, and emission spectra of planetary nebulae. The total number of observed spectral lines included in this compilation is 597. These lines participate in 972 transitions. From this list

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Naumenko, A. P., V. I. Borysuk, M. S. Iakhnenko, V. O. Gubanov, Y. L. Slominskii, and O. D. Kachkovsky. "Probing of Higher Excited States of Merocyanine Derivatives of Azaazulene and Indandione by Fluorescence Excitation Anisotropy Spectra." Ukrainian Journal of Physics 65, no. 4 (2020): 321. http://dx.doi.org/10.15407/ujpe65.4.321.

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This paper is dedicated to the spectral and quantum-chemical studies of higher excited states of merocyanine derivatives of azaazulene and indandione. A particular attention is paid to the analysis of fluorescence excitation anisotropy spectra of the mentioned compounds. The long-wave shift by ≈ 50 nm of a deep clear minimum in the fluorescence excitation anisotropy spectrum due to an elongation of the polymethine dye chromophore is established. Such shift is close in a value to the bathochromic shift of the first minimum in the anisotropy spectrum of symmetric ionic polymethine dyes, in which

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Валиев, У. В., Gary W. Burdick, Р. Р. Вильданов, R. Yu Rakhimov та Dejun Fu. "Влияние J-J-взаимодействия возбужденных состояний редкоземельного иона Pr-=SUP=-3+-=/SUP=- на магнитополяризованную люминесценцию празеодим-иттриевого граната-алюминия". Физика твердого тела 61, № 5 (2019): 848. http://dx.doi.org/10.21883/ftt.2019.05.47578.29f.

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AbstractThe spectra of luminescence and magnetic circular polarization of luminescence of praseodymium–yttrium aluminum garnet Pr^3+ : Y_3Al_5O_12 (PrYAG) are studied in the visible spectral region at temperature T = 300 K. An analysis of spectral dependences of magnetooptical and optical spectra makes it possible to identify optical 4 f –4 f -transitions between Stark sublevels of multiplets ^3 P _0, ^3 P _1, ^3 Н _5, and ^3 Н _6 in PrYAG. It was shown that an important role in the spectrum of the degree of magnetic circular polarization of luminescence of this paramagnetic garnet is played b

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Abbosov, B., S. Sh Akhmedov, and A. P. Murtazaev. "Optical properties of bismuth films." Low Temperature Physics 19, no. 10 (1993): 812–14. https://doi.org/10.1063/10.0033520.

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Optical absorption spectra of Bi films are studied in the visible, infrared and ultraviolet spectral regions in the temperature range 4.2–300 K. The spectra of absorption and interband transition energy are compared with Fal’kovskii’s theoretical analysis for bismuth.

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French, Roger H. "Quantitative analysis of spatially resolved valence electron energy-loss spectra for electronic structure studies of grain boundaries and thin intergranular films." Proceedings, annual meeting, Electron Microscopy Society of America 53 (August 13, 1995): 314–15. http://dx.doi.org/10.1017/s042482010013794x.

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The spatial variation of the electronic structure at interfaces is critical to both interatomic bonding at atomically abrupt interfaces such as grain boundaries and also to the development of van der Waals (vdW) attraction forces at partially wetted interfaces. This interfacial electronic structure, as represented by the interband transition strength , can be determined by Kramers Kronig (KK) analysis of either vacuum ultraviolet (VUV) optical reflectance spectra or spatially resolved valence electron energy loss (SR-VEEL) spectra. Quantitative analysis of SR-VEELS requires accurate spectral l

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Lozej, Črt. "Spectral Form Factor and Dynamical Localization." Entropy 25, no. 3 (2023): 451. http://dx.doi.org/10.3390/e25030451.

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Quantum dynamical localization occurs when quantum interference stops the diffusion of wave packets in momentum space. The expectation is that dynamical localization will occur when the typical transport time of the momentum diffusion is greater than the Heisenberg time. The transport time is typically computed from the corresponding classical dynamics. In this paper, we present an alternative approach based purely on the study of spectral fluctuations of the quantum system. The information about the transport times is encoded in the spectral form factor, which is the Fourier transform of the

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Bardalez Gagliuffi, Daniella C., Jacqueline K. Faherty, Genaro Suárez, et al. "The Diversity of Cold Worlds: A Blended-light Binary Straddling the T/Y Transition in Brown Dwarfs." Astrophysical Journal 984, no. 1 (2025): 74. https://doi.org/10.3847/1538-4357/adb61e.

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Abstract We present the first brown dwarf spectral binary characterized with JWST: WISE J014656.66+423410.0, the coldest blended-light brown dwarf binary straddling the T/Y transition. We obtained a moderate resolution (R ∼ 2700) G395H spectrum of this unresolved binary with JWST/NIRSpec and we fit it to late T and Y dwarf spectra from JWST/NIRSpec, and model spectra of comparable temperatures, both as individual spectra and pairs mimicking an unresolved binary system. We find that this tightly separated binary is likely composed of two unequal-brightness sources with a magnitude difference of

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Abu-Eittah, R., H. Moustafa, and A. M. Al-Omar. "The electronic absorption spectra of some N-sulfinylanilines. A molecular orbital treatment." Canadian Journal of Chemistry 75, no. 7 (1997): 934–41. http://dx.doi.org/10.1139/v97-112.

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The electronic absorption spectra of N-sulfinylaniline and some of its derivatives were investigated using different solvents. The spectral behavior of the molecules indicated their planarity and that the NSO group is a strong electron acceptor. All the observed bands correspond to delocalized π → π* transitions; n → π* transition were not observed as discrete bands. Ab initio molecular orbital calculations were performed using four different basis sets. The results showed that the NSO group is nonlinear, the molecules studied are planar, and the syn conformer is more stable than the anti conf

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Mondal, Samaresh, Agata Różańska, Patrycja Bagińska, Alex Markowitz, and Barbara De Marco. "Spectral state transitions in Circinus ULX5." Astronomy & Astrophysics 651 (July 2021): A54. http://dx.doi.org/10.1051/0004-6361/202140459.

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Context. We performed timing and spectral analyses of multi-epoch Suzaku, XMM-Newton, and NuSTAR observations of the ultraluminous X-ray source (ULX) Circinus ULX5 with the aim of putting constraints on the mass of the central object and the accretion mode operating in this source. Aims. We investigate whether the source contains a stellar mass black hole (BH) with a super-Eddington accretion flow or an intermediate mass black hole accreting matter in a sub-Eddington mode. Moreover, we search for major observed changes in spectra and timing and determine whether they are associated with major

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López, Gloria, and Pilar Estrada. "Effect of Temperature on Xylanase II from Trichoderma reesei QM 9414: A Calorimetric, Catalytic, and Conformational Study." Enzyme Research 2014 (September 7, 2014): 1–16. http://dx.doi.org/10.1155/2014/708676.

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The secondary structure of xylanase II from Trichoderma reesei is lost in an apparent irreversible cooperative process as temperature is increased with a midpoint transition of 58.8 ± 0.1°C. The shift of the spectral centre of mass above 50°C is also apparently cooperative with midpoint transition of 56.3 ± 0.2°C, but the existence of two isofluorescent points in the fluorescence emission spectra suggests a non-two-state process. Further corroboration comes from differential scanning calorimetry experiments. At protein concentrations ≤0.56 mg·mL−1 the calorimetric transition is reversible and

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Rathore, Uma, S.N. Jatolia, S. K. Verma, and Singh Ranveer. "Spectral Properties and Applications of Ln (III) Ion and Their Complexes." Pharmaceutical and Chemical Journal 1, no. 3 (2014): 40–43. https://doi.org/10.5281/zenodo.13692077.

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In lanthanides transitions involve only a redistribution of electrons within the 4f-orbitals (f↔f transition) are orbitally forbidden by the selection rule. Crystal field effects in lanthanides are virtually insignificant due to 4f-electrons are well shielded from external charge by 5s<sup>2</sup> and 5p<sup>6</sup> sub-shells.  Their (f↔f transition) absorption bands are very sharp. Their optical spectra are virtually independent of environment they show similar spectra in gas/solution/solid (sharp lines like typical gas atom spectra).  Analysis of the UV-Visible spectra f

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Huang, Wen-Jian, Sheng-Lung Chou, Shu-Yu Lin, Hui-Fen Chen, and Yu-Jong Wu. "Direct UV absorption spectra of CO2+ in solid neon." Low Temperature Physics 50, no. 9 (2024): 733–36. http://dx.doi.org/10.1063/10.0028139.

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The IR and UV absorption spectra of CO2+ isolated in solid neon were studied by using our newly built mass-selective matrix isolation system. The IR absorption spectrum revealed the formation of CO2 in both cationic and anionic forms in solid Ne, since neutral CO2 was also used to serve as an electron scavenger in this study. Subsequently, we recorded the UV absorption spectrum of the same matrix sample in the spectral region 270−400 nm, encompassing the electronic transitions of CO2+ from the ground state to the first two electronic excited states. Notably, the observation of the electronic t

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Zhang (张曾华), Z. H., A. J. Burgasser, M. C. Gálvez-Ortiz, et al. "Primeval very low-mass stars and brown dwarfs – VI. Population properties of metal-poor degenerate brown dwarfs." Monthly Notices of the Royal Astronomical Society 486, no. 1 (2019): 1260–82. http://dx.doi.org/10.1093/mnras/stz777.

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ABSTRACT We presented 15 new T dwarfs that were selected from UKIRT Infrared Deep Sky Survey, Visible and Infrared Survey Telescope for Astronomy , and Wide-field Infrared Survey Explorer surveys, and confirmed with optical to near-infrared spectra obtained with the Very Large Telescope and the Gran Telescopio Canarias. One of these new T dwarfs is mildly metal-poor with slightly suppressed K-band flux. We presented a new X-shooter spectrum of a known benchmark sdT5.5 subdwarf, HIP 73786B. To better understand observational properties of brown dwarfs, we discussed transition zones (mass ranges

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Jablunovskis, A., E. P. Chukalina, L. H. Yin, and M. N. Popova. "High-Resolution Spectroscopy of the ErCrO3 Crystal: A New Phase Transition?" JETP Letters 118, no. 2 (2023): 92–99. http://dx.doi.org/10.1134/s0021364023601884.

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Infrared absorption spectra of the ErCrO3 crystal in the region of $$f{-} f$$ transitions in the Er3+ ion are recorded for the first time. An analysis of high-resolution temperature-dependent spectra reveals a step at $$T{\kern 1pt} ' = 47$$ K on the temperature dependences of the characteristics of spectral lines, in addition to the features at temperatures of magnetic ordering TN = 133 K and spin-reorientation transition $${{T}_{{{\text{SR}}}}} = 9.3{\kern 1pt} $$ K. This feature can be associated with either a previously unknown phase transition or with local changes in the crystal structur

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Costa-Mello, Daniel R., Simone Daflon, and Claudio B. Pereira. "Quantitative Spectral Analysis of hot Post-AGB Stars." Proceedings of the International Astronomical Union 5, S265 (2009): 356–57. http://dx.doi.org/10.1017/s1743921310000906.

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AbstractPost-AGB (PAGB) stars are luminous objects of low and intermediate mass in a final and short stage of evolution in the transition between AGB stars and planetary nebulae (PNe). In this work we present a quantitative spectral analysis of some hot PAGBs based on high resolution spectra. The stellar parameters and chemical composition were obtained from the synthesis of non-LTE spectra.

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Kajava, J. J. E., C. Sánchez-Fernández, J. Alfonso-Garzón, S. E. Motta, and A. Veledina. "Rapid spectral transition of the black hole binary V404 Cygni." Astronomy & Astrophysics 634 (February 2020): A94. http://dx.doi.org/10.1051/0004-6361/201937191.

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During the June 2015 outburst of the black hole binary V404 Cyg, rapid changes in the X-ray brightness and spectra were common. The INTEGRAL monitoring campaign detected spectacular Eddington-limited X-ray flares, but also rapid variations at much lower flux levels. On 2015 June 21 at 20 h 50 min, the 3–10 keV JEM-X data as well as simultaneous optical data started to display a gradual brightening from one of these low-flux states. This was followed 15 min later by an order-of-magnitude increase of flux in the 20–40 keV IBIS/ISGRI light curve in just 15 s. The best-fitting model for both the p

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RODRIGUEZ, JEROME, and LIONEL PRAT. "IS THE CORONA THE SOURCE OF THE EJECTED MATERIAL IN MICROQUASARS?" International Journal of Modern Physics D 19, no. 06 (2010): 777–82. http://dx.doi.org/10.1142/s0218271810017020.

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Microquasar outbursts are characterized by spectral state transitions. The transitions between states characterized by a hard spectrum and those characterized by a soft spectrum are of particular interest. Besides drastic spectral and timing changes, these transitions often show discrete ejections detectable in the radio domain. The mechanisms giving birth to the ejections, the links with accretion and the exact nature of the ejected material are still largely unknown. We present systematic X–ray spectral analysis prior to the ejection in several microquasars, and show that, in each case, the

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S., Levcenko, Hajdeu-Chicarosh E., Garcia-Llamas E., et al. "Spectroscopic ellipsometry study of Cu2ZnSnS4 bulk poly-crystals." Applied Physics Letters 112, no. 16 (2018): 161901. https://doi.org/10.1063/1.5024683.

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The linear optical properties of Cu<sub>2</sub>ZnSnS<sub>4</sub> bulk poly-crystals have been investigated using spectroscopic ellipsometry in the range 1.2 – 4.6 eV at room temperature. The characteristic features identified in the optical spectra are explained by using the Adachi analytical model for the interband transitions at the corresponding critical points in the Brillouin zone (BZ). The experimental data have been modeled over the entire spectral range taking into account the lowest E<sub>0</sub> transition near the fundamental absorption edge, and E<sub>1A</sub> and E<sub>1B</s

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Neal, Sharon L. "Multivariate Analysis of Mixed Lipid Aggregate Phase Transitions Monitored Using Raman Spectroscopy." Applied Spectroscopy 72, no. 1 (2017): 102–13. http://dx.doi.org/10.1177/0003702817729347.

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The phase behavior of aqueous 1,2-dimyristoyl-sn-glycero-3-phosphorylcholine (DMPC)/1,2-dihexanoyl-sn-glycero-3-phosphocholine (DHPC) mixtures between 8.0 ℃ and 41.0 ℃ were monitored using Raman spectroscopy. Temperature-dependent Raman matrices were assembled from series of spectra and subjected to multivariate analysis. The consensus of pseudo-rank estimation results is that seven to eight components account for the temperature-dependent changes observed in the spectra. The spectra and temperature response profiles of the mixture components were resolved by applying a variant of the non-nega

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Qianze, Liu, He Wenping, Xie Xiaoqiang, Mei Ying, Sun Hui, and Boers Niklas. "Early warning signal of abrupt change in sea level pressure based on changing spectral exponent." Chaos, Solitons and Fractals 187 (November 13, 2024): 115350. https://doi.org/10.5281/zenodo.14141308.

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<strong>A</strong><strong>bst</strong><strong>r</strong><strong>act</strong> When a complex system crosses its critical points, abrupt change will occur with potentially catastrophic consequences. It is therefore crucial to investigate early warning signals for such transitions. Some studies show that the changing spectral exponent could serve as an early warning signal, as a dynamical system approaches its critical transition point. However, the performance of the spectral exponent may be influenced by different bifurcation types and spectral estimation techniques. We therefore first test the

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Burgess, B. H., Andre R. Erler, and Theodore G. Shepherd. "The Troposphere-to-Stratosphere Transition in Kinetic Energy Spectra and Nonlinear Spectral Fluxes as Seen in ECMWF Analyses." Journal of the Atmospheric Sciences 70, no. 2 (2013): 669–87. http://dx.doi.org/10.1175/jas-d-12-0129.1.

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Abstract Global horizontal wavenumber kinetic energy spectra and spectral fluxes of rotational kinetic energy and enstrophy are computed for a range of vertical levels using a T799 ECMWF operational analysis. Above 250 hPa, the kinetic energy spectra exhibit a distinct break between steep and shallow spectral ranges, reminiscent of dual power-law spectra seen in aircraft data and high-resolution general circulation models. The break separates a large-scale “balanced” regime in which rotational flow strongly dominates divergent flow and a mesoscale “unbalanced” regime where divergent energy is

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Hsu, Hung-Pin, Pong-Hong Yang, Jeng-Kuang Huang, et al. "Photoreflectance Spectroscopy Characterization of Ge/Si0.16Ge0.84Multiple Quantum Wells on Ge Virtual Substrate." Advances in Condensed Matter Physics 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/298190.

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We report a detailed characterization of a Ge/Si0.16Ge0.84multiple quantum well (MQW) structure on Ge-on-Si virtual substrate (VS) grown by ultrahigh vacuum chemical vapor deposition by using temperature-dependent photoreflectance (PR) in the temperature range from 10 to 300 K. The PR spectra revealed a wide range of optical transitions from the MQW region as well as transitions corresponding to the light-hole and heavy-hole splitting energies of Ge-on-Si VS. A detailed comparison of PR spectral line shape fits and theoretical calculation led to the identification of various quantum-confined i

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Соболев, В. В., та Д. А. Перевощиков. "Оптические переходы в кристаллах ZnSe и CdTe с участием d-зон катионов". Физика и техника полупроводников 52, № 3 (2018): 304. http://dx.doi.org/10.21883/ftp.2018.03.45613.8629.

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AbstractThe permittivity spectra ε_1( E ) and ε_2( E ) of ZnSe and CdTe crystals are calculated in the range of 10–25 eV using their experimental reflectance spectra and Kramers–Kronig integral relations. The spectra are decomposed into thirteen and twelve separate transition bands for ZnSe and CdTe, respectively, using the improved nonparametric combined Argand diagram technique. The main spectral parameters, including the maximum energies and halfwidths and oscillator strengths, are determined. The oscillator strengths are found to be within 0.1–1.4 for ZnSe and 0.2–0.7 for CdTe. The obtaine

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Bridgeman, A. "Spectral intensities of transition metal complexes." Coordination Chemistry Reviews 165, no. 1 (1997): 315–446. http://dx.doi.org/10.1016/s0010-8545(97)00020-9.

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Bridgeman, A. J., and M. Gerloch. "Spectral intensities of transition metal complexes." Coordination Chemistry Reviews 165 (October 1997): 315–446. http://dx.doi.org/10.1016/s0010-8545(97)90163-6.

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Maharam, Dorothy. "Spectral representation of generalized transition kernels." Israel Journal of Mathematics 98, no. 1 (1997): 15–28. http://dx.doi.org/10.1007/bf02937327.

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