CORRELATION-EFFECTS ON RAMAN-SCATTERING FROM LOW-ENERGY VIBRATIONAL-MODES IN GLASSES .2. EXPERIMENTAL RESULTS

被引：88

作者：

ACHIBAT, T

BOUKENTER, A

DUVAL, E

机构：

[1] Laboratoire de Physico-Chimie des Matériaux Luminescents, Université Claude Bernard Lyon I-URA CNRS no 442, Bât. 205, 69622 Villeurbanne Cedex, 43

来源：

JOURNAL OF CHEMICAL PHYSICS | 1993年 / 99卷 / 03期

关键词：

D O I：

10.1063/1.465268

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

New experimental results of low-frequency Raman scattering from different glasses are presented. They are compared to the vibration density of states obtained from inelastic neutron scattering to deduce the light-vibration coupling coefficient C(omega) as a function of the vibration frequency. It was found that C(omega) is-proportional-to omega2 at very low frequency omega < 20 cm-1 in inorganic glasses (SiO2,B2O3) and that C(omega) is-proportional-to omega at low frequency in polymer glasses and in inorganic glasses for omega > 20 cm-1. Our experimental results for glasses are interpreted by assuming no correlation at very low-frequency and only radial correlation at low-frequency. A full correlation would exist in silica-aerogels in which the effect of random fluctuations would be negligible.

引用

页码：2046 / 2051

页数：6

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