Spectres infrarouge et Raman de KSCN à l'état cristallin

1967 ◽  
Vol 45 (14) ◽  
pp. 1677-1684 ◽  
Author(s):  
R. Savoie ◽  
M. Pézolet
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Room Temperature ◽  
Far Infrared ◽  
Potassium Thiocyanate ◽  
Factor Group ◽  
Crystalline Phases ◽  
Stretching Vibration ◽  
Lattice Modes

The Raman spectrum of potassium thiocyanate has been recorded at various temperatures between − 195 and 185 °C. The predicted factor-group splitting of the C—N stretching vibration in the crystal at room temperature has been observed. The spectra of the two crystalline phases differ mainly in the lattice region. The far-infrared spectrum has also been recorded, and the existence of lattice modes at 25–30 cm−1 is shown to be doubtful.

The Far Infrared Spectra of Partially Orientationally Ordered Water Molecules: Hexamethylenetetramine Hexahydrate at 95 K

1975 ◽  
Vol 53 (17) ◽  
pp. 2642-2645 ◽  
Author(s):  
John E. Bertie ◽  
Marco Solinas
Keyword(s):  
Infrared Spectrum ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Clathrate Hydrate ◽  
Factor Group ◽  
Water Molecules ◽  
Disordered Solids ◽  
Ordered Water ◽  
Far Infrared Spectra ◽  
Three Phases

The far infrared spectra of four isotopic modifications of the partially orientationally ordered clathrate hydrate hexamethylenetetramine hexahydrate at 95 K are reported. The spectra are assigned to absorption allowed under the diffraction factor group, and to disorder-allowed absorption, following the theory for absorption by translational vibrations in orientationally disordered solids. Three phases formed primarily by hydrogen-bonded water molecules are known to be significantly, but only partially, orientationally ordered, hexamethylenetetramine hexahydrate, ice V, and ice VI. Of these phases, only ice VI fails to show sharp absorption in its far infrared spectrum in addition to the broad, disorder-allowed absorption.

FAR INFRARED AND RAMAN SPECTRA AND STRUCTURE OF DITHIOPHOSGENE

1964 ◽  
Vol 42 (9) ◽  
pp. 2107-2112 ◽  
Author(s):  
W. K. Busfield ◽  
M. J. Taylor ◽  
E. Whalley
Keyword(s):  
Raman Spectrum ◽  
Infrared Spectrum ◽  
Raman Spectra ◽  
Far Infrared ◽  
Infrared And Raman Spectra ◽  
Tentative Assignment

The infrared spectrum in the range 3000–50 cm−1 and the Raman spectrum of solutions of dithiophosgene have been obtained. There are no coincidences in the infrared and Raman spectra, and the only structure consistent with this and approximately tetrahedral carbon valencies is[Formula: see text]that is tetrachloro-1,3-dithietane, in which the ring is planar or nearly planar. A tentative assignment of the observed bands is given on the basis of D2h symmetry.

RAMAN SPECTRUM OF CRYSTALLINE AND LIQUID SO2

1965 ◽  
Vol 43 (8) ◽  
pp. 2271-2278 ◽  
Author(s):  
A. Anderson ◽  
R. Savoie
Keyword(s):  
Raman Spectrum ◽  
Sulfur Dioxide ◽  
Group Analysis ◽  
Factor Group ◽  
Factor Group Analysis ◽  
Crystalline Defects ◽  
Isotopic Species ◽  
Defects And Impurities ◽  
Lattice Modes

The Raman spectrum of crystalline sulfur dioxide has been recorded at several temperatures between 9 and 185 °K. The main features are in accord with those predicted from the factor group analysis for the known structure of the crystal. Additional peaks were also observed, some arising from isotopic species and lattice fundamentals. As an aid to the assignment of several other bands, the spectrum of the liquid has also been recorded to distinguish the specifically crystalline features. Possible causes of these extra peaks, such as combinations with lattice modes, crystalline defects, and impurities, are briefly discussed.

The far infrared spectrum of H2O2 observed and calculated rotational levels of the torsional states : (n, τ) = (0, 1), (0, 3) and (1, 1)

1988 ◽  
Vol 49 (11) ◽  
pp. 1901-1910 ◽  
Author(s):  
F. Masset ◽  
L. Lechuga-Fossat ◽  
J.-M. Flaud ◽  
C. Camy-Peyret ◽  
J.W.C. Johns ◽  
...  
Keyword(s):  
Infrared Spectrum ◽  
Far Infrared

scholarly journals High-Pressure Spectroscopy Study of Zn(IO3)2 Using Far-Infrared Synchrotron Radiation

Crystals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Akun Liang ◽  
Robin Turnbull ◽  
Enrico Bandiello ◽  
Ibraheem Yousef ◽  
Catalin Popescu ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transitions ◽  
Synchrotron Radiation ◽  
Infrared Radiation ◽  
Room Temperature ◽  
Far Infrared ◽  
Low Pressure ◽  
Pressure Response ◽  
Spectroscopy Study ◽  
Far Infrared Radiation

We report the first high-pressure spectroscopy study on Zn(IO3)2 using synchrotron far-infrared radiation. Spectroscopy was conducted up to pressures of 17 GPa at room temperature. Twenty-five phonons were identified below 600 cm−1 for the initial monoclinic low-pressure polymorph of Zn(IO3)2. The pressure response of the modes with wavenumbers above 150 cm−1 has been characterized, with modes exhibiting non-linear responses and frequency discontinuities that have been proposed to be related to the existence of phase transitions. Analysis of the high-pressure spectra acquired on compression indicates that Zn(IO3)2 undergoes subtle phase transitions around 3 and 8 GPa, followed by a more drastic transition around 13 GPa.

Far-infrared spectrum and ground state constants of methyl amine

1987 ◽  
Vol 126 (2) ◽  
pp. 443-459 ◽  
Author(s):  
Nobukimi Ohashi ◽  
Kojiro Takagi ◽  
Jon T. Hougen ◽  
W.Bruce Olson ◽  
Walter J. Lafferty
Keyword(s):  
Infrared Spectrum ◽  
Ground State ◽  
Far Infrared ◽  
Methyl Amine

The resonance Raman spectra and excitation profiles of some 4-sulfamylazobenzenes

1977 ◽  
Vol 55 (9) ◽  
pp. 1444-1453 ◽  
Author(s):  
Kamal Kumar ◽  
P. R. Carey
Keyword(s):  
Raman Spectrum ◽  
Raman Spectra ◽  
Resonance Raman ◽  
Valence Bond ◽  
Wavelength Dependence ◽  
Accurate Estimation ◽  
Intensity Changes ◽  
Stretching Vibration ◽  
Resonance Raman Spectra ◽  
Frequency Changes

The resonance Raman spectra of three pharmacologically important sulfonamides, 4-sulfamyl-4′-dimethylaminoazobenzene (1), 4-sulfamyl-4′-hydroxyazobenzene (2), and 4-sulfamyl-4′-aminoazobenzene (3), are compared with those of analogues lacking the sulfonamide group. The —SO2NH2 moiety does not directly contribute intense or moderately intense bands to the resonance Raman spectra of 1, 2, and 3. However, —SO2NH2 ionization is reflected by frequency changes in a band near 1140 cm−1 and intensity changes in the 1420 cm−1 region. The normal Raman spectrum of 2 confirms that the intensity changes reflect —SO2NH2 ionization rather than unrelated changes in vibronic coupling. The effect of —OH ionization on the resonance Raman spectrum of 2 emphasizes that caution must be exercised when relating spectral perturbations to changes in contributions from valence bond type structures. Resonance Raman excitation profiles for the 1138, 1387, and 1416 cm−1 bands of 2 show that these bands gain intensity by coupling with the electronic transitions in the 240 to 450 nm region and that, more than 1000 cm−1 to the red of λmax, the wavelength dependence can be closely reproduced by the FB type terms of Albrecht and Hutley. The excitation profile for each band shows evidence for structure in the 470 nm region, although lack of sufficient excitation wavelengths prevents accurate estimation of the spacing. Under conditions of rigorous resonance the intense Raman lines all occur in the 1400 cm−1 region, i.e. they are 'bunched' in the region known to contain the —N=N— stretching vibration.

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