CAN POSITRON-ANNIHILATION LIFETIME SPECTROSCOPY MEASURE THE FREE-VOLUME HOLE SIZE DISTRIBUTION IN AMORPHOUS POLYMERS

被引：54
|
作者：
YU, Z [1 ]
MCGERVEY, JD [1 ]
JAMIESON, AM [1 ]
SIMHA, R [1 ]
机构：
[1] CASE WESTERN RESERVE UNIV,DEPT MACROMOLEC SCI,CLEVELAND,OH 44106
来源：
MACROMOLECULES | 1995年 / 28卷 / 18期
关键词：
D O I：
10.1021/ma00122a038
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We discuss the theoretical basis for relating the mean ortho-positronium (o-Ps) lifetime to free-volume hole sizes using a finite spherical potential well model. The status of the localized o-Ps atom in amorphous polymers is evaluated by calculation of the o-Ps barrier transmission probability. The results indicate that the relative probability for an o-Ps atom to remain in a particular hole during its entire lifetime is on the order of 10(-2). We conclude that there is no justification for a one-to-one correlation of o-Ps lifetime components with specific hole sizes.
引用
收藏
页码：6268 / 6272
页数：5
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