Low energy positron scattering and annihilation studies using a high resolution trap-based beam

被引：46

作者：

Sullivan, JP ^{[1
]}

Gilbert, SJ ^{[1
]}

Marler, JP ^{[1
]}

Barnes, LD ^{[1
]}

Buckman, SJ ^{[1
]}

Surko, CM ^{[1
]}

机构：

[1] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2002年 / 192卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

positron; scattering; atoms; molecules; cross-sections; annihilation;

D O I：

10.1016/S0168-583X(02)00700-0

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

A high resolution positron beam, generated from a Penning-Malmberg trap, has been used for a range of low energy scattering and annihilation studies on atoms and molecules. We describe measurements of total scattering, differential elastic scattering and integral vibrational and electronic excitation cross sections for a number of atoms and molecules using this beam, and compare the absolute cross sections that are obtained with data from electron impact. The first study of annihilation on atoms and molecules as a function of positron energy is described. The results in molecules indicate large resonant enhancements of the annihilation rates at energies corresponding to those of the molecular vibrations. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：3 / 16

页数：14

共 45 条

[11] LOW-ENERGY POSITRON-H2 COLLISIONS IN THE DISTRIBUTED POSITRON MODEL
GIBSON, TL
[J]. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1992, 25 (06) : 1321 - 1336
[12] Positron scattering from atoms and molecules at low energies
Gilbert, SJ
Greaves, RG
Surko, CM
[J]. PHYSICAL REVIEW LETTERS, 1999, 82 (25) : 5032 - 5035
[13] Low-energy positron scattering from atoms and molecules using positron accumulation techniques
Gilbert, SJ
Sullivan, J
Greaves, RG
Surko, CM
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2000, 171 (1-2) : 81 - 95
[14] Creation of a monoenergetic pulsed positron beam
Gilbert, SJ
Kurz, C
Greaves, RG
Surko, CM
[J]. APPLIED PHYSICS LETTERS, 1997, 70 (15) : 1944 - 1946
[15] GILBERT SJ, 2001, COMMUNICATION
[16] ON THE RESONANCE ANNIHILATION OF POSITRONS IN COLLISIONS WITH NEUTRAL ATOMS OR MOLECULES
GOLDANSKII, VI
SAYASOV, YS
[J]. PHYSICS LETTERS, 1964, 13 (04): : 300 - 301
[17] Mechanisms of positron annihilation on molecules
Gribakin, GF
[J]. PHYSICAL REVIEW A, 2000, 61 (02): : 13
[18] POSITRON LIFETIME SPECTRA FOR GASES
HEYLAND, GR
CHARLTON, M
GRIFFITH, TC
WRIGHT, GL
[J]. CANADIAN JOURNAL OF PHYSICS, 1982, 60 (04) : 503 - 516
[19] MASS-SPECTROMETRY STUDIES OF THE IONIZATION OF ORGANIC-MOLECULES BY LOW-ENERGY POSITRONS
HULETT, LD
DONOHUE, DL
XU, J
LEWIS, TA
MCLUCKEY, SA
GLISH, GL
[J]. CHEMICAL PHYSICS LETTERS, 1993, 216 (1-2) : 236 - 240
[20] gamma-Ray spectra from positron annihilation on atoms and molecules
Iwata, K
Greaves, RG
Surko, CM
[J]. PHYSICAL REVIEW A, 1997, 55 (05) : 3586 - 3604

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