Positron annihilation in polypropylene studied by lifetime and coincidence Doppler-broadening spectroscopy

被引：20
|
作者：
Djourelov, N
He, C
Suzuki, T
Shantarovich, VP
Ito, Y
Kondo, K
Ito, Y
机构：
[1] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050032, Japan
[2] Russian Acad Sci, Inst Chem Phys, Moscow 117334, Russia
[3] Univ Tokyo, JAERI, RCNT, Tokai, Ibaraki 3191106, Japan
来源：
RADIATION PHYSICS AND CHEMISTRY | 2003年 / 68卷 / 05期
关键词：
positron annihilation; Doppler broadening; coincidence Doppler system; PP; antioxidant; carbonyl group; irradiation effect; core electrons;
D O I：
10.1016/S0969-806X(03)00442-0
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 momentum density distributions (MDDs) of electrons taking part in the annihilation processes in polypropylene (PP) have been measured by coincidence Doppler-broadening spectroscopy. MDDs at the beginning of measurements to those at the saturation level of Ps formation have been compared in order to follow the possible changes in concentration of carbonyl groups (CG). A high initial CG concentration in PP has been observed, while for antioxidant-containing PP no significant presence of CG has been detected, and no changes have been observed during positron irradiation. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：689 / 695
页数：7
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