Theoretical study of the ν3 and ν4 Raman bands of methane in rare gas matrices

1976 ◽  
Vol 54 (13) ◽  
pp. 2154-2161 ◽  
Author(s):  
Koji Kobashi ◽  
Yosuke Kataoka ◽  
Tsunenobu Yamamoto
Keyword(s):  
Raman Scattering ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Low Temperatures ◽  
Theoretical Study ◽  
Mutual Exclusion ◽  
Theoretical Work ◽  
Rare Gas ◽  
Vibration Rotation

Theoretical study has been carried out on the Raman spectra of the ν3 and ν4 vibration bands of methane in Ar, Kr, and Xe matrices at low temperatures. The present study is a continuation of a theoretical work by Nishiyama and Yamamoto on the infrared spectra of the same Systems. We consider the symmetry of the System under the group [Formula: see text] introducing the inversion functions to generalize Wigner's rotational functions. As a result, dual assignments are given to each vibration–rotation state. The allowed transitions of the Raman scattering are compared with those of the infrared absorption, and it is found that a kind of 'rule of mutual exclusion' holds. The relative intensities and spacings of the Raman spectra are calculated and successfully compared with experiment.

Fe2+ Electronic Transitions in Raman and Infrared Spectra of FePSe3 and FePS3 Crystals

1988 ◽  
Vol 135 ◽  
Author(s):  
M. Jouanne ◽  
M.L. Sanjuan ◽  
M.A. Kanehisa ◽  
M. Balkanski ◽  
P. Cavalli ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Raman Spectra ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Electronic Transitions ◽  
Tentative Model ◽  
Polarized Raman ◽  
Absorption Measurements

AbstractPolarized Raman scattering and infrared absorption measurements were carried out in FePS3 and FePSe3 as a function of temperature. Features at 700-2000 cm−1 are shown to be essentially due to transitions among the trigonal-field-split 5T2g multiplet of the Fe2+ iron and their phonon sidebands. Though the unpolarized Raman spectra are similar in both compounds, polarized spectra are markedly different. We propose a tentative model to account for this.

Infrared absorption and resonance Raman scattering of photochromic triphenylformazans

1983 ◽  
Vol 61 (5) ◽  
pp. 809-816 ◽  
Author(s):  
J. W. Lewis ◽  
C. Sandorfy
Keyword(s):  
Excited State ◽  
Raman Scattering ◽  
Proton Transfer ◽  
Raman Spectra ◽  
Infrared Absorption ◽  
Resonance Raman ◽  
Tautomeric Equilibrium ◽  
Resonance Raman Scattering ◽  
Excited State Proton Transfer ◽  
Resonance Raman Spectra

The infrared and resonance Raman spectra of the two long-lived forms of triphenylformazan and several of its derivatives have been examined. The spectra of unsymmetrically 15N-labelled derivatives suggest that two tautomers exist for each of the two forms. This observation is confirmed by the spectra of 1-(p-halophenyl)-3,5-diphenylformazans. The spectra of the non-chelate forms of these latter compounds demonstrate that the position of the tautomeric equilibrium is influenced by the electron-attracting ability of the para-halo-substituent. A comparison of the resonance Raman spectra of the two forms leads to the conclusion that excited state proton transfer is the initial photoevent in the photochromism of the triphenylformazans.

A theoretical study of C3 molecule trapped in rare gas matrices: Influence of bent or linear configuration on the infrared spectra

1998 ◽  
Vol 229 (2-3) ◽  
pp. 347
Author(s):  
A. Lakhlifi ◽  
R. Dahoo ◽  
M. Vala ◽  
J. Szczepanski ◽  
S. Ekern
Keyword(s):  
Infrared Spectra ◽  
Theoretical Study ◽  
Rare Gas ◽  
Linear Configuration

Photochemisches Verhalten von (CF3S)2CS in Inertgasmatrix/Photochemical Behavior of (CF3S)2CS in Rare Gas Matrix

1983 ◽  
Vol 38 (2) ◽  
pp. 161-167 ◽  
Author(s):  
Karl Schlosser ◽  
Helge Willner
Keyword(s):  
Raman Spectra ◽  
Infrared Spectra ◽  
Solid Phase ◽  
Noble Gas ◽  
Complex Mixture ◽  
Equimolar Mixture ◽  
Rare Gas ◽  
Decomposition Products ◽  
The Matrix ◽  
Photochemical Decomposition

Abstract Infrared spectra have been recorded of (CF3S)2CS in the gas and solid phase as well as isolated in noble gas matrix; the Raman spectra of the liquid have also been taken. The analyses of the spectra show that this compound consists of a complex mixture of conformers. By photolysis in a matrix with light of wavelength > 300 nm the distribution of the conformers changes and with light of wavelength > 530 nm this change can be reversed. The threshold for photochemical decomposition in the matrix is about 300 nm. The decomposition products consist of an equimolar mixture of CF3SCF3 and CS2.

Polarized Raman Scattering Study of ZnGeP2 Single Crystals

1997 ◽  
Vol 484 ◽  
Author(s):  
Spirit Tlali ◽  
Howard E. Jackson ◽  
M. C. Ohmer ◽  
P. G. Schunemann ◽  
T. M. Pollak
Keyword(s):  
Raman Scattering ◽  
Single Crystals ◽  
Raman Spectra ◽  
Low Temperatures ◽  
High Quality ◽  
Crystal Orientations ◽  
Gradient Technique ◽  
Theoretical Predictions ◽  
Scattering Study ◽  
Polarized Raman

AbstractRaman scattering experiments on high quality ZnGeP2 single crystals grown by the seeded horizontal dynamic gradient technique have been carried out. Polarized Raman spectra were obtained in the backscattering geometry at both room and low temperatures for several crystal orientations and compared with group theoretical predictions. Raman spectra from as-grown and annealed samples display distinctive differences which were explored by utilizing two different excitation wavelengths: 514.3 nm and 632.8 nm; the observed differences are attributed to a surface interdiffuasion effect.

Pressure-Induced Infrared Absorption of Gaseous Hydrogen and Deuterium at Low Temperatures. III. Further Analysis of the Fundamental and First Overtone Bands of Hydrogen

1971 ◽  
Vol 49 (10) ◽  
pp. 1320-1326 ◽  
Author(s):  
A. Watanabe
Keyword(s):  
Density Dependence ◽  
Quadrupole Moment ◽  
Infrared Spectra ◽  
Infrared Absorption ◽  
Low Temperatures ◽  
Gaseous Hydrogen ◽  
Matrix Elements ◽  
Satisfactory Explanation ◽  
Satisfactory Degree ◽  
Double Transition

Pressure-induced infrared spectra of hydrogen in the fundamental region, recorded at 18, 20.4, and 24 K, have been reanalyzed making use of recently calculated theoretical matrix elements of the polarizability and the quadrupole moment of hydrogen. The analysis revealed a density dependence in the relative intensities of the single and double transition quadrupolar induced components. This density dependence was used as a correction to improve the analysis of the first overtone spectrum, obtained at 24 K with a density of 31 amagat. The observed and calculated spectra then agreed to a satisfactory degree except for a discrepancy in the intensity of the Q1(1) + Q1(J) components for which no satisfactory explanation could be given.

A theoretical study of C3 molecule trapped in rare gas matrices: Influence of bent or linear configuration on the infrared spectra

1997 ◽  
Vol 222 (2-3) ◽  
pp. 241-257 ◽  
Author(s):  
A. Lakhlifi ◽  
R. Dahoo ◽  
M. Vala ◽  
J. Szczepanski ◽  
S. Ekern
Keyword(s):  
Infrared Spectra ◽  
Theoretical Study ◽  
Rare Gas ◽  
Linear Configuration
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