摘要:

AbstractThe vibrational spectra of polycrystalline samples of titanium and tin tetrachlorides at 80 K have been investigated by Raman spectroscopic techniques. In the intramolecular region, isotopic and crystalline field splittings are observed, in substantial agreement with earlier work. In the lattice region, ten of the twelve Raman‐active lattice modes are observed. A simple model is suggested and used to distinguish the low‐frequency lattice translational from librational mo

ISSN:0377-0486    

DOI:10.1002/jrs.1250150112

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractInfrared spectra (4000–400 cm−1) of pentachlorocyclopropane have been recorded for all three of its physical states. A liquid‐phase Raman spectrum of this molecule has also been observed. Based on the Raman depolarization data, gas‐phase infrared band contours and expected group frequency correlations, it has been possible to propose an assignment for 20 of the 21 normal vibrations of pentachlorocyclopropane. This assignment agrees well with those proposed for hexachlorocyclopropane, the three isomeric tetrachlorocyclopropanes, 1,1‐dichlorocyclopropane and chlorocyclopropane. Further, the vibrational assignment for pentachlorocyclopropane has identified characteristic vibrational frequencies for the three CH(X) modes: CH stretch, 3040 cm−1; in‐plane CH bend, 1296 cm−1; and out‐of‐plane

ISSN:0377-0486    

DOI:10.1002/jrs.1250150113

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractTheory and experiment for phonon‐like polaritons in complicated bulk media are discussed. The media include crystals with diffusion, such as ionic conductors, in which the theoretical approaches of Merten and Borstel, Nakamura and Barker and London are compared; systems having polariton anomalies in the frequency region in which the two‐phonon density of states peaks, such as ammonium chloride and calcite; and lithium niobate with optical dam

ISSN:0377-0486    

DOI:10.1002/jrs.1250150114

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

摘要:

AbstractRaman and infrared spectra of polycrystalline cyanogen, C2N2, at 20 K are reported. Multiplet structure of the intramolecular fundamentals is observed and interpreted in terms of a group theoretical analysis based on the known orthorhombic crystal structure. Seven of the eight predicted librational and five of the predicted six translational modes are observed in the low‐frequency regions of the Raman and infrared spectra, respectivel

ISSN:0377-0486    

DOI:10.1002/jrs.1250150115

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY

ISSN:0377-0486    

DOI:10.1002/jrs.1250150101

出版商:John Wiley&Sons, Ltd.    

年代:1984

数据来源: WILEY