The free positron lifetime in amorphous polymers at low temperature

被引：0
|
作者：
Laforest, N. [1 ,2 ]
Bas, C. [1 ]
De Baerdemaeker, J. [2 ]
Djourelov, N. [3 ]
Dauwe, C. [2 ]
机构：
[1] Univ Savoie, LMOPS, F-73376 Le Bourget Du Lac, France
[2] Univ Ghent, Dept Subat & Radiat Phys, B-9000 Ghent, Belgium
[3] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, BU-1784 Sofia, Bulgaria
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2011年 / 248卷 / 06期
关键词：
electron traps; polymers; positron annihilation; positron lifetime; positronium; TIME-DEPENDENCE; FREE-VOLUME; ANNIHILATION; POLYETHYLENE; POLYPROPYLENE; POLYSTYRENE; BEHAVIOR;
D O I：
10.1002/pssb.201046599
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A series of amorphous polymers was studied by positron annihilation lifetime (PALS) spectroscopy at 20K each experiment lasted more than 1 week. The lifetime spectra were deconvoluted into three exponential components. In isothermal conditions, an increase of the free positron lifetime is observed while the parapositronium (pPs) and orthopositronium (oPs) lifetimes do not change with the measuring time. This upward trend was correlated to the oPs intensity change. To explain the time dependence of the free positron lifetime, a model based on heterogeneities in the electronic density and accumulation of shallowly trapped electrons (STEs) caused by the Na-22 source irradiation is proposed. The fittings give two parameters the intrinsic free positron lifetime tau(0)(2) and the Onsager radius R-0(PALS). (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
引用
收藏
页码：1453 / 1458
页数：6
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