Development of a pulsed slow-positron beam using time-varying pulsing-bias

被引：6

作者：

Hamada, E ^{[1
]}

Oshima, N

Suzuki, T

Kobayashi, H

Kondo, K

Kanazawa, I

Ito, Y

机构：

[1] Grad Univ Adv Studies, Dept Accelerator Sci, Tsukuba, Ibaraki 3050801, Japan

[2] Inst Phys & Chem Res, Atom Phys Lab, Wako, Saitama 3510198, Japan

[3] High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan

[4] Tokyo Gakugei Univ, Dept Phys, Tokyo 1840015, Japan

[5] Univ Tokyo, Nucl Sci & Technol Res Ctr, Tokai, Ibaraki 3191195, Japan

来源：

APPLIED SURFACE SCIENCE | 1999年 / 149卷 / 1-4期

基金：

日本学术振兴会;

关键词：

slow positron; pulsed positron; position annihilation; polymer;

D O I：

10.1016/S0169-4332(99)00169-5

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：

In order to study the near-surface characterization of polymers using positron-annihilation lifetime spectroscopy (PALS), a pulsed slow-positron beam system is under development. Positrons emitted hom Na-22 were injected periodically into a target by adjusting the rime of flight of positrons between the moderator and the target using a time-varying electric field. By increasing the slope of the pulsing bias, the time resolution of this system, a full width at half maximum (FWHM) of 0.82 ns has been achieved. The lifetimes of ortho-positronium (o-Ps) in high-density polyethylene (HDPE) and polytetrafluoroethylene (PTFE) were obtained as 2.5 and 4.1 ns, respectively, by PALS using our new system. These values agree with those obtained by the conventional PALS. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：40 / 43

页数：4

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