Depth-dependent positron annihilation in different polymers

被引：8

作者：

Yang, J. ^{[1
]}

Zhang, P. ^{[1
]}

Cheng, G. D. ^{[1
]}

Li, D. X. ^{[1
]}

Wu, H. B. ^{[1
]}

Li, Z. X. ^{[1
]}

Cao, X. Z. ^{[1
]}

Jia, Q. J. ^{[2
]}

Yu, R. S. ^{[1
]}

Wang, B. Y. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Anal Tech, Beijing 100049, Peoples R China

[2] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100049, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2013年 / 280卷

关键词：

Positron annihilation; Doppler broadening; Polymer; Atomic electronegativity; FREE-VOLUME; BEAMS; SPECTROSCOPY; POLYETHYLENE; ENVIRONMENT; POLYIMIDES; INTERFACES; SURFACE; HOLES;

D O I：

10.1016/j.apsusc.2013.04.104

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：

Depth-dependent positron annihilation Doppler broadening measurements were conducted for polymers with different chemical compositions. Variations of the S parameter with respect to incident positron energy were observed. For pure hydrocarbons PP, HDPE and oxygen-containing polymer PC, S parameter rises with increasing positron implantation depth. While for PI and fluoropolymers like PTFE, ETFE and PVF, S parameter decreases with higher positron energy. For chlorine-containing polymer PVDC, S parameter remains nearly constant at all incident positron energies. It is suggested that these three variation trends are resulted from a competitive effect between the depth-dependent positronium formation and the influence of highly electronegative atoms on positron annihilation characteristics. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：109 / 112

页数：4

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