Electron ejection by positron impact ionization

A. Kövér, K. Paludan, G. Laricchia

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The ejected-electron energy spectrum resulting from positron impact ionization of molecular hydrogen has recently been measured at an incident energy of 50 eV. The ejected electron and the scattered positron have been measured in coincidence around 0° with a new parallel-plate analyser having time-focusing properties. A 1.6 eV shift towards lower energies has been found in the electron-spectrum relative to a theoretical prediction. The shift may indicate the occurrence of ionization simultaneous to another energy loss, e.g. vibrational excitation or molecular dissociation of the target. To test this hypothesis, studies have begun with a helium target.

Original languageEnglish
Pages (from-to)167-170
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume192
Issue number1-2
DOIs
Publication statusPublished - May 2002

Fingerprint

Impact ionization
Positrons
ejection
positrons
dissociation
ionization
Electrons
shift
parallel plates
Helium
energy spectra
electrons
energy dissipation
helium
occurrences
electron energy
Ionization
energy
Hydrogen
Energy dissipation

Keywords

  • Electron capture
  • Positron molecule collision

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Instrumentation
  • Surfaces and Interfaces

Cite this

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title = "Electron ejection by positron impact ionization",
abstract = "The ejected-electron energy spectrum resulting from positron impact ionization of molecular hydrogen has recently been measured at an incident energy of 50 eV. The ejected electron and the scattered positron have been measured in coincidence around 0° with a new parallel-plate analyser having time-focusing properties. A 1.6 eV shift towards lower energies has been found in the electron-spectrum relative to a theoretical prediction. The shift may indicate the occurrence of ionization simultaneous to another energy loss, e.g. vibrational excitation or molecular dissociation of the target. To test this hypothesis, studies have begun with a helium target.",
keywords = "Electron capture, Positron molecule collision",
author = "A. K{\"o}v{\'e}r and K. Paludan and G. Laricchia",
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language = "English",
volume = "192",
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TY - JOUR

T1 - Electron ejection by positron impact ionization

AU - Kövér, A.

AU - Paludan, K.

AU - Laricchia, G.

PY - 2002/5

Y1 - 2002/5

N2 - The ejected-electron energy spectrum resulting from positron impact ionization of molecular hydrogen has recently been measured at an incident energy of 50 eV. The ejected electron and the scattered positron have been measured in coincidence around 0° with a new parallel-plate analyser having time-focusing properties. A 1.6 eV shift towards lower energies has been found in the electron-spectrum relative to a theoretical prediction. The shift may indicate the occurrence of ionization simultaneous to another energy loss, e.g. vibrational excitation or molecular dissociation of the target. To test this hypothesis, studies have begun with a helium target.

AB - The ejected-electron energy spectrum resulting from positron impact ionization of molecular hydrogen has recently been measured at an incident energy of 50 eV. The ejected electron and the scattered positron have been measured in coincidence around 0° with a new parallel-plate analyser having time-focusing properties. A 1.6 eV shift towards lower energies has been found in the electron-spectrum relative to a theoretical prediction. The shift may indicate the occurrence of ionization simultaneous to another energy loss, e.g. vibrational excitation or molecular dissociation of the target. To test this hypothesis, studies have begun with a helium target.

KW - Electron capture

KW - Positron molecule collision

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U2 - 10.1016/S0168-583X(02)00862-5

DO - 10.1016/S0168-583X(02)00862-5

M3 - Article

AN - SCOPUS:0036576926

VL - 192

SP - 167

EP - 170

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

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