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Journal articles on the topic 'Approximation de Raman'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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1

Sobti, Lokesh, Vaibhav Arora, and Hardeep Singh. "Linear Power Division Approximation for Stimulated Raman Scattering." Fiber and Integrated Optics 33, no. 4 (2014): 299–305. http://dx.doi.org/10.1080/01468030.2014.914264.

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2

Peterson, P. R., and A. Gavrielides. "Raman ring resonator stability in the adiabatic approximation." Journal of the Optical Society of America B 7, no. 1 (1990): 101. http://dx.doi.org/10.1364/josab.7.000101.

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3

Shamrov, N. I. "Quasiresonance approximation for cooperative raman scattering of light." Journal of Applied Spectroscopy 63, no. 1 (1996): 71–74. http://dx.doi.org/10.1007/bf02606628.

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4

Davies, John A., Ronald C. Davidson, and George L. Johnston. "Compton and Raman free electron laser stability properties for a cold electron beam propagating through a helical magnetic wiggler." Journal of Plasma Physics 33, no. 3 (1985): 387–423. http://dx.doi.org/10.1017/s0022377800002580.

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This paper gives an extensive characterization of the range of validity of the Compton and Raman approximations to the exact free electron laser dispersion relation for a cold, relativistic electron beam propagating through a constantamplitude helical wiggler magnetic field. The electron beam is treated as infinite in transverse extent. Specific properties of the exact and approximate dispersion relations are investigated analytically and numerically. In particular, a detailed numerical analysis is carried out to determine the range of validity of the Compton approximation.
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5

Choi, Jun-Ho, and Minhaeng Cho. "Amide I Raman optical activity of polypeptides: Fragment approximation." Journal of Chemical Physics 130, no. 1 (2009): 014503. http://dx.doi.org/10.1063/1.3050294.

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6

Nafie, Laurence A. "Theory of Raman scattering and Raman optical activity: near resonance theory and levels of approximation." Theoretical Chemistry Accounts 119, no. 1-3 (2007): 39–55. http://dx.doi.org/10.1007/s00214-007-0267-9.

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7

Impellizzeri, A., A. A. Vorfolomeeva, N. V. Surovtsev, A. V. Okotrub, C. P. Ewels, and D. V. Rybkovskiy. "Simulated Raman spectra of bulk and low-dimensional phosphorus allotropes." Physical Chemistry Chemical Physics 23, no. 31 (2021): 16611–22. http://dx.doi.org/10.1039/d1cp02636d.

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The Placzek approximation with DFT accurately reproduces experimental Raman spectra for phosphorus allotropes. We explain bulk allotrope spectral features in black and white phosphorus, and predict spectra for phosphorus nanostructures.
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8

Володин, В. А., В. А. Сачков та М. П. Синюков. "Запрещенное резонансное комбинационное рассеяние света в сверхрешетках GaAs/AlAs: эксперимент и расчеты". Физика и техника полупроводников 52, № 6 (2018): 569. http://dx.doi.org/10.21883/ftp.2018.06.45917.8671.

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AbstractThe Raman spectra of GaAs/AlAs(100) superlattices are calculated and studied experimentally for various wave-vector directions. The experiments are performed when applying a confocal optical microscope combined with a micro-Raman spectrometer for various scattering geometries both for phonons with a wave vector directed along the normal to a superlattice and in the in-plane geometry. The frequencies and eigenvectors of phonons are calculated in the extended Born model approximation taking into account Coulomb interaction in the rigid-ion approximation. The Raman spectra are calculated
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9

Jirkovský, Jakub, Kateřina Macounová, Hartmut Dietz, Waldfried Plieth, Petr Krtil, and Stanislav Záliš. "Raman Spectroscopy of Nanocrystalline Li-Ti-O Spinels and Comparative DFT Calculations on TiyOz and LixTiyOz Clusters." Collection of Czechoslovak Chemical Communications 72, no. 2 (2007): 171–84. http://dx.doi.org/10.1135/cccc20070171.

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Raman spectra of cubic nanocrystalline insertion hosts in Li-Ti-O system were measured for Li1.1Ti1.9O4-δspinels and the corresponding delithiated titanium dioxide material. To interpret the measured data optimized geometries of cubic TiyOzand LixTiyOzwere calculated using the DFT cluster approach for clusters containing up to 23 atoms. The calculated geometries were used to predict the density-of-states (DOS) diagrams and vibrational spectra of the corresponding structures upon harmonic approximation. While the DFT approach reproduces satisfactorily the main structural characteristics of TiyO
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10

Thang, Nguyen Manh. "Appearance of an ensemble solitary pulse train in transient backward stimulated Raman scattering." Communications in Physics 25, no. 3 (2016): 275. http://dx.doi.org/10.15625/0868-3166/25/3/6770.

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A self-similarity approximation model for three-wave resonant interaction in transient backward stimulated Raman scattering (BSRS) was derived. Interestingly, as its asymptotic solution, the train of solitary backward Raman pulse train is possibly formed. This result can be considered as an increment of “single” soliton observed previously [A. Abdolvand et al., Phys. Rev. Lett 103, 183902 (2009)].
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11

Walter, Michael, and Michael Moseler. "Ab Initio Wavelength-Dependent Raman Spectra: Placzek Approximation and Beyond." Journal of Chemical Theory and Computation 16, no. 1 (2019): 576–86. http://dx.doi.org/10.1021/acs.jctc.9b00584.

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12

Stasyuk, I. V., and T. S. Mysakovych. "Raman scattering in strongly corelated electron systems. Strong coupling approximation." Journal of Physical Studies 10, no. 1 (2006): 54–65. http://dx.doi.org/10.30970/jps.10.54.

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13

Davies, John A., Ronald C. Davidson, and George L. Johnston. "Pulse shapes for absolute and convective free-electron-laser instabilities." Journal of Plasma Physics 40, no. 1 (1988): 1–37. http://dx.doi.org/10.1017/s0022377800013106.

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This paper contains an analysis of pulse shapes produced by a delta-function disturbance of the equilibrium state of a relativistic electron beam propagating through a constant-amplitude, helical magnetic wiggler field. Pulse shapes are determined by using the relativistic pinch-point techniques developed by Bers, Ram and Francis. Two pulses are produced corresponding to a convective upshifted pulse (representing the production of the high-frequency radiation desired in a free electron laser) and a downshifted pulse. The downshifted instability may be convective or absolute, depending upon the
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14

Trajic, J., M. Gilic, N. Romcevic, et al. "Raman spectroscopy of optical properties in CdS thin films." Science of Sintering 47, no. 2 (2015): 145–52. http://dx.doi.org/10.2298/sos1502145t.

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Properties of CdS thin films were investigated applying atomic force microscopy (AFM) and Raman spectroscopy. CdS thin films were prepared by using thermal evaporation technique under base pressure 2 x 10-5 torr. The quality of these films was investigated by AFM spectroscopy. We apply Raman scattering to investigate optical properties of CdS thin films, and reveal existence of surface optical phonon (SOP) mode at 297 cm-1. Effective permittivity of mixture were modeled by Maxwell - Garnet approximation.
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15

Králik, Martin, Stanislav Jurečka, and Emil Pinčík. "Thickness and tensile stress determination of black silicon layers by spectral reflectance and Raman scattering." Journal of Electrical Engineering 70, no. 7 (2019): 51–57. http://dx.doi.org/10.2478/jee-2019-0041.

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Abstract In this work black silicon (b-Si) samples were prepared by anodic (electrochemical) etching of p-type silicon substrate in solution of hydrofluoric acid (HF). We studied influence of anodic etching conditions (etching time, electrical potential and current) on the spectral reflectance and Raman scattering spectra. Optical properties of b-Si structures were experimentally studied by UV-VIS (AvaSpec-2048) and Raman (Thermo DXR Raman) spectrometers. B-Si layer thickness of formed substrate were determined by using SCOUT software. Effective medium approximation theory (Looyenga) was used
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16

Schmid, Eduard D., and Eleonore Brodbek. "Raman intensity calculations with the CNDO method. Part III: N,N-dimethylamide – water complexes." Canadian Journal of Chemistry 63, no. 7 (1985): 1365–71. http://dx.doi.org/10.1139/v85-233.

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Absolute differential Raman scattering coefficients of hydrogen bondedN,N-dimethylformamide (DMF) – water complexes and a N,N-dimethylacetamide (DMA) – water complex are calculated with a variational method within the CNDO approximation using an extended basis set. Changes of Raman intensities caused by intermolecular interactions are modeled in our Raman intensity calculations and the calculated intensities of the amide I (C=O stretching), OCN bending, and N—(Me)2 stretching vibration of the DMF (and DMA) – water complexes are compared with the experimental absolute Raman intensities of DMF a
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17

Jarzȩcki, Andrzej A. "Quantum-Mechanical Calculations of Resonance Raman Intensities: The Weighted-Gradient Approximation." Journal of Physical Chemistry A 113, no. 12 (2009): 2926–34. http://dx.doi.org/10.1021/jp8095715.

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18

Sherman, E. Ya, and O. V. Misochko. "Raman scattering in metals with disorder: beyond the zero-momentum approximation." Journal of Physics: Condensed Matter 15, no. 22 (2003): 3751–58. http://dx.doi.org/10.1088/0953-8984/15/22/309.

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19

Stronski, Alexander. "Positron Annihilation Lifetime Spectroscopy Measurement of Ge5As37S58 Glass." Advanced Materials Research 854 (November 2013): 111–15. http://dx.doi.org/10.4028/www.scientific.net/amr.854.111.

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Defect configuration of Ge5As37S58chalcogenide glasses was studied by positron annihilation lifetime spectra (PALS). Size of nanovoids was determined using Liaos formula for radius of nanovoids in spherical approximation. Peculiarities of structural features were obtained from Raman spectra.
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20

Singh, Ram Kishor, and R. P. Sharma. "Stimulated Raman backscattering of filamented hollow Gaussian beams." Laser and Particle Beams 31, no. 3 (2013): 387–94. http://dx.doi.org/10.1017/s0263034613000384.

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AbstractThis paper presents a model for excitation of electron plasma wave and resulting stimulated Raman scattering due to presence of a laser beam carrying null intensity in center (hollow Gaussian beam) in a collisionless plasma. We have studied the self-focusing of the hollow Gaussian beam and its effect on back stimulated Raman scattering process in the presence of ponderomotive nonlinearity. To understand the nature of propagation of the hollow Gaussian beam, electron plasma wave and back reflectivity, a paraxial-ray approximation has been invoked. It is predicted that self-focusing and
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21

Mantashian, Grigor A., Paytsar A. Mantashyan, Hayk A. Sarkisyan, et al. "Exciton-Related Raman Scattering, Interband Absorption and Photoluminescence in Colloidal CdSe/CdS Core/Shell Quantum Dots Ensemble." Nanomaterials 11, no. 5 (2021): 1274. http://dx.doi.org/10.3390/nano11051274.

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By using the numerical discretization method within the effective-mass approximation, we have theoretically investigated the exciton-related Raman scattering, interband absorption and photoluminescence in colloidal CdSe/CdS core/shell quantum dots ensemble. The interband optical absorption and photoluminescence spectra have been revealed for CdSe/CdS quantum dots, taking into account the size dispersion of the ensemble. Numerical calculation of the differential cross section has been presented for the exciton-related Stokes–Raman scattering in CdSe/CdS quantum dots ensemble with different mean
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22

Gornushkin, I. B., P. E. Eagan, A. B. Novikov, B. W. Smith, and J. D. Winefordner. "Automatic Correction of Continuum Background in Laser-Induced Breakdown and Raman Spectrometry." Applied Spectroscopy 57, no. 2 (2003): 197–207. http://dx.doi.org/10.1366/000370203321535123.

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The goal of this work was the development and evaluation of an algorithm for the approximation and automatic subtraction of continuum backgrounds in laser-induced breakdown and Raman spectra. The background correction algorithm was applied to simple and complex spectra and its effect on identification accuracy was studied. Linear correlation was used for the identification of plastic samples using both laser-induced breakdown and Raman spectra. For both techniques, the algorithm successfully eliminated continuum background without compromising spectral integrity. A significant improvement in t
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23

Yoshikawa, Masanobu. "Abnormal Raman Spectral Variation with Excitation Wavelength in Boron-Doped Single-Crystalline Diamond." Materials Science Forum 858 (May 2016): 1158–61. http://dx.doi.org/10.4028/www.scientific.net/msf.858.1158.

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The Raman spectra of boron-doped single-crystalline diamond were measured at excitation wavelengths between 364.0 and 1064.0 nm and found that the first-order Raman band at 1332 cm-1 shifts to the low-frequency side, broadens, and develops a derivative-like lineshape as the boron concentration increases. The derivative-like lineshape can be explained by Fano interference. Furthermore, I found that the asymmetric lineshape changes between excitation wavelengths of 514.5 and 785.0 nm. From a comparison of the normalized relative Raman intensity as a function of the excitation energy and the dens
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24

Lu, Hai Yan. "Hydrogen Isotopic Effects of Uranium Hydrides: First-Principles Calculations." Materials Science Forum 817 (April 2015): 675–84. http://dx.doi.org/10.4028/www.scientific.net/msf.817.675.

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In this paper, we study the ground-state and lattice dynamical properties of β-UH--3by means of the first-principles density functional theory within the local spin-density approximation (LSDA)+Uformulism. The lattice constants and electronic structure are correctly described by taking into account the strong on-site Coulomb repulsion among the 5felectrons localized on uranium atoms. Good agreement with experiments is achieved by tuning the effective Hubbard parameter at around 4 eV. The phonon band structure confirms the dynamical stability of β-UH--3, and the Raman-active modes are consisten
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25

Hovhannisyan, L. A., and A. Zh Muradyan. "Improvement of the Raman-Nath approximation for the resonant Kapitza-Dirac scattering." Journal of Contemporary Physics (Armenian Academy of Sciences) 45, no. 1 (2010): 12–16. http://dx.doi.org/10.3103/s1068337210010032.

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26

Kumar, Ashok, and P. S. Gupta. "Higher-order amplitude squeezing in hyper-Raman scattering under short-time approximation." Quantum and Semiclassical Optics: Journal of the European Optical Society Part B 8, no. 5 (1996): 1053–60. http://dx.doi.org/10.1088/1355-5111/8/5/010.

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27

Rukhlenko, Ivan D., Malin Premaratne, Chethiya Dissanayake, and Govind P. Agrawal. "Continuous-wave Raman amplification in silicon waveguides: beyond the undepleted pump approximation." Optics Letters 34, no. 4 (2009): 536. http://dx.doi.org/10.1364/ol.34.000536.

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28

Kane, Krista A., and Lasse Jensen. "Calculation of Absolute Resonance Raman Intensities: Vibronic Theory vs Short-Time Approximation." Journal of Physical Chemistry C 114, no. 12 (2009): 5540–46. http://dx.doi.org/10.1021/jp906152q.

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29

Rukhlenko, Ivan D., Malin Premaratne, and Govind P. Agrawal. "Maximization of Gain in Slow-Light Silicon Raman Amplifiers." International Journal of Optics 2011 (2011): 1–7. http://dx.doi.org/10.1155/2011/581810.

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We theoretically study the problem of Raman gain maximization in uniform silicon photonic-crystal waveguides supporting slow optical modes. For the first time, an exact solution to this problem is obtained within the framework of the undepleted-pump approximation. Specifically, we derive analytical expressions for the maximum signal gain, optimal input pump power, and optimal length of a silicon Raman amplifier and demonstrate that the ultimate gain is achieved when the pump beam propagates at its maximum speed. If the signal’s group velocity can be reduced by a factor of 10 compared to its va
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30

Mizunami, Toru, and Keiji Takagi. "Effect of Self-Induced Raman Scattering on Soliton Propagation-Comparison between Raman Response Function Method and Linear-Gain Approximation." Japanese Journal of Applied Physics 33, Part 1, No. 12A (1994): 6582–83. http://dx.doi.org/10.1143/jjap.33.6582.

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31

Ait Haddouch, Mohammed, Youssef Tamraoui, Fatima-Ezzahra Mirinioui, et al. "Structural, electronic, optical properties and first-principles calculations of Sr1-xCaxWO4 ceramics." Mediterranean Journal of Chemistry 9, no. 3 (2019): 199–211. http://dx.doi.org/10.13171/mjc93191005355mah/yt.

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A series of strontium calcium tungstates Sr1-xCaxWO4 powders with (x = 0; 0.25; 0.5; 0.75 and 1.0) were prepared by solid-state reaction method and analyzed by X-ray diffraction (XRD). All these compositions possess a tetragonal scheelite structure with I41/a space group. Raman active vibrational modes in the range from 20 to 1000 cm-1 of the series Sr1-xCaxWO4 with tetragonal structure exhibit 13 modes in arrangement with the Group theory analysis of structural Raman-active modes. The optical properties were investigated using the diffuse reflectance UV–visible absorbance spectrum. Based on
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32

Mohammed, Abdelsalam, Yu-Ping Sun, Quan Miao, Hans Ågren, and Faris Gel'mukhanov. "Raman Scattering at Resonant or Near-Resonant Conditions: A Generalized Short-Time Approximation." Chinese Journal of Chemical Physics 25, no. 1 (2012): 31–47. http://dx.doi.org/10.1088/1674-0068/25/01/31-47.

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33

de Mul, F. F. M., H. B. G. ten Have, C. Otto, and J. Greve. "The MCGA (multiple cubic gradient approximation) method for the analysis of Raman spectra." Journal of Raman Spectroscopy 21, no. 11 (1990): 725–36. http://dx.doi.org/10.1002/jrs.1250211105.

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34

Jean, John M., and Richard A. Friesner. "An accurate and efficient decoupling approximation for temperature‐dependent multimode resonance Raman spectra." Journal of Chemical Physics 85, no. 5 (1986): 2353–64. http://dx.doi.org/10.1063/1.451089.

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35

Albrecht, A. C., Robin J. H. Clark, Dan Oprescu, Suzanne J. R. Owens, and Christian Svendsen. "Overtone resonance Raman scattering beyond the Condon approximation: Transform theory and vibronic properties." Journal of Chemical Physics 101, no. 3 (1994): 1890–903. http://dx.doi.org/10.1063/1.468434.

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36

Mihailova, B., L. Konstantinov, and E. Dinolova. "Cluster-approximation modelling of infrared and Raman spectra of crystalline and vitreous CaSiO3." Journal of Non-Crystalline Solids 191, no. 1-2 (1995): 79–84. http://dx.doi.org/10.1016/0022-3093(95)00313-4.

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37

Golabczak, Marcin, and Andrzej Konstantynowicz. "Quantitative Evaluation of the Raman Spectra of Carbon Layers." Defect and Diffusion Forum 312-315 (April 2011): 265–70. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.265.

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The Raman effect has been widely used for years for carbon layers analysis for qualitative analysis of samples as well as quantitative. Two main lines of attitude to the quantitative analysis of the Raman spectra have been de¬ve¬lo¬ped. The first one is applied mainly in forensic investigations when one has pre¬pa¬red comparative samples which consist of known substances with known concentration. This is the ba¬se for comparison of spectra from unknown sample. A tool used in these in¬ves¬ti¬ga¬tions is the Voigt profile based on Faddeeva function, allowing a very precise com¬pa¬rison of spectr
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38

Borovoi, Anatoli, Jens Reichardt, Ulrich Görsdorf, et al. "Retrieving microphysics of cirrus clouds from data measured with raman lidar ramses and a tilted ceilometer." EPJ Web of Conferences 176 (2018): 08002. http://dx.doi.org/10.1051/epjconf/201817608002.

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To develop a microphysical model of cirrus clouds, data obtained by Raman lidar RAMSES and a tilted ceilometer are studied synergistically. The measurements are interpreted by use of a data archive containing the backscattering matrixes as well as the depolarization, color and lidar ratios of ice crystals of different shapes, sizes and spatial orientations calculated within the physical-optics approximation.
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39

Susi, Heino, and D. Michael Byler. "Fourier Deconvolution of the Amide I Raman Band of Proteins as Related to Conformation." Applied Spectroscopy 42, no. 5 (1988): 819–26. http://dx.doi.org/10.1366/0003702884428905.

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Fourier deconvolution has been employed to enhance the resolution of the amide I Raman band of nine proteins found in milk and/or other foods. The broad band was resolved into several components. The overall shape of the amide I Raman band of proteins was found to be nearly Gaussian or to be composed of Gaussian components. A Gaussian function was therefore used for deconvolution. The results obtained were more detailed than those obtained with the Lorentzian approximation usually employed. The resolved band components were assigned to specific protein conformations. The frequencies and assign
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40

Kim, Hyun-Jung, Ji-Hyun Jang, Sang Uk Woo, et al. "Effect of Novel Bioactive Glass-Containing Dentin Adhesive on the Permeability of Demineralized Dentin." Materials 14, no. 18 (2021): 5423. http://dx.doi.org/10.3390/ma14185423.

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This study aimed to evaluate the effect of a novel bioactive glass (BAG)-containing dentin adhesive on the permeability of demineralized dentin. Bioactive glass (85% SiO2, 15% CaO) was fabricated using the sol-gel process, and two experimental dentin adhesives were prepared with 3 wt% silica (silica-containing dentin adhesive; SCA) or BAG (BAG-containing dentin adhesive; BCA). Micro-tensile bond strength (μTBS) test, fracture mode analysis, field-emission scanning electron microscopy (FE-SEM) analysis of adhesive and demineralized dentin, real-time dentinal fluid flow (DFF) rate measurement, a
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41

Haslett, T. L., R. J. C. Brown, Y. S. Park, and H. F. Shurvell. "Isotope Shifts in Ammonium Perrhenate." Zeitschrift für Naturforschung A 41, no. 1-2 (1986): 335–37. http://dx.doi.org/10.1515/zna-1986-1-262.

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Isotope shifts in the NQR and Raman spectra o f ammonium perrhenate due to 15H and 2H substitution are reported. The effect of isotopic substitution at the nitrogen on the NQR spectrum is zero; in the Raman spectrum the translational lattice modes of the ammonium ion are clearly differentiated from the torsional modes. The effect of deuteration on the NQR frequency has been measured to high accuracy and confirms that to a moderately good approximation the effect of deuteration is equivalent to the application of pressure. The effect of deuteration on the lattice parameters has been measured. N
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42

Wan, M. L., H. J. Du, Y. L. Song, F. Q. Zhou, and K. J. Dai. "Tunable localized surface plasmon resonances of asymmetric Au/SiO2/Au cross-shape nanobars." Modern Physics Letters B 28, no. 17 (2014): 1450143. http://dx.doi.org/10.1142/s0217984914501437.

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The plasmonic properties of asymmetric Au / SiO 2/ Au sandwiched cross-shape nanobars are investigated theoretically using the discrete dipole approximation (DDA) method. Two localized surface plasmon resonances are observed in the extinction spectra, which perform extreme sensitivity to the length and width of the nanobar and can be tuned easily throughout visible and into near-infrared spectral regions. The local electric fields around the nanobar are calculated and a pure electromagnetic Raman enhancement factor of about 106 can be achieved. In addition, compared to a monolayer gold nanobar
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43

Boutahar, A., and M. Loete. "Développement complet de la polarisabilité des molécules tétraédriques XY4." Canadian Journal of Physics 69, no. 1 (1991): 26–35. http://dx.doi.org/10.1139/p91-005.

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A new model of polarizability is presented consistent with the Hamiltonian of tetrahedral molecules XY4. Using a coupling scheme in the Td group, polarizability operators are obtained up to any order of approximation for all vibration–rotation bands of any symmetry. This model leads to an unique formula for matrix elements of these operators. We also give the general expression for the Raman intensity of a transition.
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44

Sheka, Elena F., Yevgeny A. Golubev, and Nadezhda A. Popova. "Graphene Domain Signature of Raman Spectra of sp2 Amorphous Carbons." Nanomaterials 10, no. 10 (2020): 2021. http://dx.doi.org/10.3390/nano10102021.

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The standard D-G-2D pattern of Raman spectra of sp2 amorphous carbons is considered from the viewpoint of graphene domains presenting their basic structure units (BSUs) in terms of molecular spectroscopy. The molecular approximation allows connecting the characteristic D-G doublet spectra image of one-phonon spectra with a considerable dispersion of the C=C bond lengths within graphene domains, governed by size, heteroatom necklace of BSUs as well as BSUs packing. The interpretation of 2D two-phonon spectra reveals a particular role of electrical anharmonicity in the spectra formation and attr
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45

MAHMOUD, SALEH T., and R. P. SHARMA. "Effect of pump depletion and self-focusing (hot spot) on stimulated Raman scattering in laser–plasma interaction." Journal of Plasma Physics 64, no. 5 (2000): 613–21. http://dx.doi.org/10.1017/s0022377800008898.

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A three-dimensional study of the pump depletion and self-focusing (hot spot) effect on stimulated Raman scattering (SRS) reflectivity is presented within the paraxial-ray approximation. The reflectivity of SRS is observed to exhibit a maximum value in the case of optimum SRS gain with pump depletion. The reflectivity with pump depletion is less than without pump depletion and is the usual three-wave interaction case. The effect of plasma temperature on SRS reflectivity is also discussed.
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46

DEVREESE, J. T., V. M. FOMIN, and S. N. KLIMIN. "PHONON-INDUCED FEATURES IN OPTICAL SPECTRA OF QUANTUM DOTS: BREAKDOWN OF THE ADIABATIC APPROXIMATION." International Journal of Modern Physics B 15, no. 28n30 (2001): 3579–83. http://dx.doi.org/10.1142/s0217979201008196.

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A theory of photoluminescence and Raman scattering in semiconductor quantum dots is developed, which relies on two key ingredients. First, it takes into account non-adiabaticity of the exciton-phonon system. Second, it includes a multimode dielectric model of LO-phonons and of the electron-phonon interaction in confined systems. Our approach is applied to calculate the optical spectra of several quantum-dot structures: ensembles of spherical CdSe, CdSe x S 1-x and PbS quantum dots, self-assembled InAs/GaAs and CdSe/ZnSe quantum dots, brick-shaped InAs/GaAs quantum dots created by local anodic
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47

Чернышев, В. А. "Фононный спектр La-=SUB=-2-=/SUB=-Zr-=SUB=-2-=/SUB=-O-=SUB=-7-=/SUB=-: ab initio расчет". Журнал технической физики 127, № 11 (2019): 758. http://dx.doi.org/10.21883/os.2019.11.48511.337-18.

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Crystal structure and phonon spectrum of La2Zr2O7 were studied within the framework of density functional theory and MO LKAO approach. The calculations were performed by using hybrid functionals that takes into account both local and nonlocal (in the Hartree–Fock formalism) exchange. The frequencies, types, and intensities of Raman and IR modes are determined. The elastic constants have been calculated too. The calculations were performed in the CRYSTAL17 program intended for simulating periodic structures in the MO LCAO approximation.
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48

GIRI, DILIP KUMAR, and P. S. GUPTA. "nTH-ORDER SQUEEZING OF THE FIELD AMPLITUDE IN RAMAN PROCESS AS A GENERALIZATION OF THE HIGHER-ORDER SQUEEZING." International Journal of Modern Physics B 19, no. 11 (2005): 1943–53. http://dx.doi.org/10.1142/s0217979205029444.

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The concept of nth-order amplitude squeezing is introduced in the fundamental mode in Raman process as a generalization of the higher-order squeezing under short-time approximation based on a fully quantum mechanical approach. The condition for occurrence of nth-order squeezing is obtained from which higher-order squeezing up to n = 5 are studied. The coupled Heisenberg equation of motion involving real and imaginary parts of the quadrature operators is established. Dependence of squeezing on photon number is also established.
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49

Ghaffari-Oskooei, Sara S., and Farzin M. Aghamir. "Analysis of Raman scattering of self-focused Gaussian laser beam in plasma without WKB approximation." Physics of Plasmas 24, no. 2 (2017): 023117. http://dx.doi.org/10.1063/1.4976850.

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50

Yang, Wen‐Hui, George C. Schatz, and Richard P. Van Duyne. "Discrete dipole approximation for calculating extinction and Raman intensities for small particles with arbitrary shapes." Journal of Chemical Physics 103, no. 3 (1995): 869–75. http://dx.doi.org/10.1063/1.469787.

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