LOW-TEMPERATURE DYNAMICS IN AMORPHOUS SOLIDS - A PHOTON-ECHO STUDY

被引:56
作者
MEIJERS, HC
WIERSMA, DA
机构
[1] Ultrafast Laser and Spectroscopy Laboratory, Department of Chemistry, University of Groningen, 9747 AG Groningen
关键词
D O I
10.1063/1.468321
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
The long-lived stimulated photon echo is put forward as a powerful technique to probe structural dynamics in glasses and other amorphous solids. We present results of optical dephasing measurements on several doped organic glasses (deuterated ethanol, toluene, and triethylamine) and polymers (polystyrene, polyvinylbutyral, and polymethylmethacrylate). Using a stochastic analysis within the so-called two-level-system model, we can extract from these measurements the distribution function of fluctuation rates over a huge range of time scales, varying from picoseconds to hundreds of milliseconds. We show that the dynamics, which lies at the origin of spectral diffusion, is very dependent on the glass structure and can be described by two separate hyperbolic distribution functions of fluctuation rates. From longitudinal photon echo measurements in the population dimension, we find evidence for structural dynamics which is not accounted for in the standard two-level-system model and which is related to a spatially inhomogeneous distribution of fluctuation centers.
引用
收藏
页码:6927 / 6943
页数:17
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