Relaxational Molecular Motions in Simple Organic Liquids: Studies with Low-Wavenumber Depolarized Raman Spectroscopy
1997; Wiley; Volume: 28; Issue: 1 Linguagem: Inglês
10.1002/(sici)1097-4555(199701)28
ISSN1097-4555
AutoresHideyuki Nakayama, Sachiko Yajima, Tomohiro Yoshida, Kikujiro Ishii,
Tópico(s)Spectroscopy and Chemometric Analyses
ResumoDepolarized Raman spectra of simple organic liquids in the wavenumber region 0–200 cm-1 were measured. The data were analyzed by assuming model spectral functions in this entire wavenumber region but by putting stress on the relaxational mode which lies in the lowest wavenumber region. For 11 simple organic liquids at room temperature, the relaxation time τ was obtained and also the parameter β which represents the distribution of τ; τ ranges from 1 to 5 ps. For toluene and tetrahydrofuran, the temperature evolution of the spectra was measured. It was found that τ of these liquids increases as the temperature is lowered. This is in harmony with the increasing viscosity with decrease in temperature. It was found that β is close to unity for most of the liquids studied, which implies a small distribution of τ in simple organic liquids. © 1997 by John Wiley & Sons, Ltd.
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