Anomalous isotope effect in the relaxation of the SD and SH vibrational stretch modes in amorphous As2S3

被引：8

作者：

Engholm, JR ^{[1
]}

Rella, CW ^{[1
]}

Schwettman, HA ^{[1
]}

Happek, U ^{[1
]}

机构：

[1] STANFORD UNIV,STANFORD PICOSECOND FREE ELECT LASER CTR,WW HANSEN EXPT PHYS LAB,STANFORD,CA 94305

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 77卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.77.1302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The vibrational relaxation rate of the SD stretching mode in amorphous As2S3 is found to be comparable to that of the SH molecule in the same material. This result is in marked contrast to the behavior expected for multiphonon decay into vibrational quanta of the amorphous host. The lack of an isotope effect in the relaxation rate is shown to be due to an efficient decay channel into a high frequency local vibrational mode of the impurity molecule. Our results demonstrate that local modes cannot only influence but can dominate the decay of molecular impurities in solids.

引用

页码：1302 / 1305

页数：4

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