Depth-dependent positron annihilation in different polymers

被引：7
|
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
收藏
页码：109 / 112
页数：4
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