Positronium fraction in polymer spectra determined by ETLA model

被引：6
作者：
Kansy, J
Suzuki, T
机构：
[1] Silesian Univ, Inst Phys & Chem Met, PL-40007 Katowice, Poland
[2] High Energy Accelerator Res Org KEK, Radiat Sci Ctr, Tsukuba, Ibaraki 3050801, Japan
来源：
RADIATION PHYSICS AND CHEMISTRY | 2003年 / 68卷 / 3-4期
关键词：
positronium; thermalization; localization polymers; source irradiation effect; ETLA;
D O I：
10.1016/S0969-806X(03)00217-2
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：
A theoretical model (ETLA) is tested by means of amorphous poly(methylphenyl-silenemethylene) (PMPSM) and high-density semicrystalline polyethylene (PE) lifetime spectra. The ETLA main assumption is a finite time of positironium (Ps) localization. The spectra are analyzed with a new version of LT program, which enables one to fit many spectra simultaneously. Estimated values of the localization time constants are 137 ps for PMPSM and 101 ps for PE. The spectra are measured at T < T-g one by one for 1 h each. The positron irradiation effect is observed and electron detrapping time constants are determined. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码：497 / 500
页数：4
相关论文
共 8 条
[1]   A new view on positronium in polymers [J].
Dauwe, C ;
Consolati, G ;
Kansy, J ;
Van Waeyenberge, B .
PHYSICS LETTERS A, 1998, 238 (06) :379-384
[2]   Positronium formation at low temperatures: the role of trapped electrons [J].
Hirade, T ;
Maurer, FHJ ;
Eldrup, M .
RADIATION PHYSICS AND CHEMISTRY, 2000, 58 (5-6) :465-471
[3]   The effect of visible light irradiation on positronium formation in polyethylene at low temperature [J].
Ito, Y ;
Hirade, T ;
Hamada, E ;
Suzuki, T ;
Ito, Y .
ACTA PHYSICA POLONICA A, 1999, 95 (04) :533-538
[4]   Study of poly(methylphenylsilylenemethylene) by elastic thermalization lifetime analysis [J].
Kansy, J ;
Suzuki, T ;
Ogawa, T ;
Murakami, M .
RADIATION PHYSICS AND CHEMISTRY, 2000, 58 (5-6) :545-550
[5]   Microcomputer program for analysis of positron annihilation lifetime spectra [J].
Kansy, J .
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1996, 374 (02) :235-244
[6]   Synthesis, thermal and mechanical properties of poly(methylphenylsilmethylene)s [J].
Ogawa, T ;
Murakami, M .
CHEMISTRY OF MATERIALS, 1996, 8 (06) :1260-1267
[7]   What do we learn from the electric field effect on Ps formation in liquids? [J].
Stepanov, SV ;
Wang, CL ;
Kobayashi, Y ;
Byakov, VM ;
Hirata, K .
RADIATION PHYSICS AND CHEMISTRY, 2000, 58 (5-6) :403-409
[8]  
SUZUKI T, 1977, MATER SCI FORUM, V255, P351
1