Experimental studies of the interaction of low energy positrons with atoms and molecules

J. P. Marler; L. D. Barnes; S. J. Gilbert; J. P. Sullivan; J. A. Young; C. M. Surko

doi:10.1016/j.nimb.2004.03.035

Experimental studies of the interaction of low energy positrons with atoms and molecules

J. P. Marler, L. D. Barnes, S. J. Gilbert, J. P. Sullivan, J. A. Young, C. M. Surko^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

This paper presents recent data on positron annihilation below and above the threshold for positronium formation in atoms and molecules. Use of a trap-based beam allows experimentation down to 50 meV and up to tens of electron volts with an energy resolution of 25 meV (FWHM). Above positronium formation, results are presented for absolute cross-section measurements in argon. Below positronium formation, absolute Z_eff spectrum in argon, xenon and the alkane molecules are presented. Data are compared to other experimental and theoretical results where available. The effect of fluorination of hydrocarbons on Z_eff below the threshold for Ps formation as well as other outstanding questions are discussed.

Original language	English
Pages (from-to)	84-92
Number of pages	9
Journal	Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume	221
Issue number	1-4
DOIs	https://doi.org/10.1016/j.nimb.2004.03.035
Publication status	Published - Jul 2004
Externally published	Yes

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title = "Experimental studies of the interaction of low energy positrons with atoms and molecules",

abstract = "This paper presents recent data on positron annihilation below and above the threshold for positronium formation in atoms and molecules. Use of a trap-based beam allows experimentation down to 50 meV and up to tens of electron volts with an energy resolution of 25 meV (FWHM). Above positronium formation, results are presented for absolute cross-section measurements in argon. Below positronium formation, absolute Zeff spectrum in argon, xenon and the alkane molecules are presented. Data are compared to other experimental and theoretical results where available. The effect of fluorination of hydrocarbons on Zeff below the threshold for Ps formation as well as other outstanding questions are discussed.",

keywords = "Positron, Positron annihilation, Positronium, Z",

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T1 - Experimental studies of the interaction of low energy positrons with atoms and molecules

AU - Marler, J. P.

AU - Barnes, L. D.

AU - Gilbert, S. J.

AU - Sullivan, J. P.

AU - Young, J. A.

AU - Surko, C. M.

PY - 2004/7

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N2 - This paper presents recent data on positron annihilation below and above the threshold for positronium formation in atoms and molecules. Use of a trap-based beam allows experimentation down to 50 meV and up to tens of electron volts with an energy resolution of 25 meV (FWHM). Above positronium formation, results are presented for absolute cross-section measurements in argon. Below positronium formation, absolute Zeff spectrum in argon, xenon and the alkane molecules are presented. Data are compared to other experimental and theoretical results where available. The effect of fluorination of hydrocarbons on Zeff below the threshold for Ps formation as well as other outstanding questions are discussed.

AB - This paper presents recent data on positron annihilation below and above the threshold for positronium formation in atoms and molecules. Use of a trap-based beam allows experimentation down to 50 meV and up to tens of electron volts with an energy resolution of 25 meV (FWHM). Above positronium formation, results are presented for absolute cross-section measurements in argon. Below positronium formation, absolute Zeff spectrum in argon, xenon and the alkane molecules are presented. Data are compared to other experimental and theoretical results where available. The effect of fluorination of hydrocarbons on Zeff below the threshold for Ps formation as well as other outstanding questions are discussed.

KW - Positron

KW - Positron annihilation

KW - Positronium

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SP - 84

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JO - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms

IS - 1-4

ER -

Experimental studies of the interaction of low energy positrons with atoms and molecules

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