POSITRONIUM FORMATION AS A PROBE OF POLYMER SURFACES AND THIN-FILMS

被引：157

作者：

XIE, L ^{[1
]}

DEMAGGIO, GB ^{[1
]}

FRIEZE, WE ^{[1
]}

DEVRIES, J ^{[1
]}

GIDLEY, DW ^{[1
]}

HRISTOV, HA ^{[1
]}

YEE, AF ^{[1
]}

机构：

[1] UNIV MICHIGAN, DEPT MAT SCI & ENGN, ANN ARBOR, MI 48109 USA

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 74卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.74.4947

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The lifetime, τ3, and formation fraction, I3, of triplet positronium decaying in the void volume near a polymer surface are measured versus the positron implantation energy, E. The strong E dependence of I3 supports a spur-electron capture model of Ps formation with deduced spur sizes ranging from 200 to 660 Å. Thin film measurements indicate that the mean probe depth can be much smaller, given mainly by the average positron implantation distance, z̄(E). Surface-induced changes in the void size and glass transition temperature of polystyrene are searched for at z̄ 40 Å. © 1995 The American Physical Society.

引用

页码：4947 / 4950

页数：4

共 29 条

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