Forward electron emission in collisions of He2+ ions with Ar atoms with simultaneous capture of two electrons

L. Sarkadi, D. Nagy

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Abstract

The energy spectrum of the electrons ejected in forward direction from Ar atoms with simultaneous bound-state capture of two electrons has been measured by impact of 30 keV/amu He2+ ions with the aim to clarify the discrepancy between the results of two previous experiments concerning the existence of the cusp-shaped peak for electrons with velocity close to the ion velocity. A peak structure has been observed which is dominated by a broad cusp attributed to the zero-energy electron emission in the projectile-centered reference system at the 2S3 excitation threshold of He0. Further narrower peaks have been identified as results of the decay of autodetachment resonant states of He- populated during the collision by three-electron bound-state capture.

Original languageEnglish
Article number042709
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume94
Issue number4
DOIs
Publication statusPublished - Oct 31 2016

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electron emission
collisions
cusps
atoms
ions
electrons
reference systems
projectiles
energy spectra
thresholds
decay
excitation
energy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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abstract = "The energy spectrum of the electrons ejected in forward direction from Ar atoms with simultaneous bound-state capture of two electrons has been measured by impact of 30 keV/amu He2+ ions with the aim to clarify the discrepancy between the results of two previous experiments concerning the existence of the cusp-shaped peak for electrons with velocity close to the ion velocity. A peak structure has been observed which is dominated by a broad cusp attributed to the zero-energy electron emission in the projectile-centered reference system at the 2S3 excitation threshold of He0. Further narrower peaks have been identified as results of the decay of autodetachment resonant states of He- populated during the collision by three-electron bound-state capture.",
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N2 - The energy spectrum of the electrons ejected in forward direction from Ar atoms with simultaneous bound-state capture of two electrons has been measured by impact of 30 keV/amu He2+ ions with the aim to clarify the discrepancy between the results of two previous experiments concerning the existence of the cusp-shaped peak for electrons with velocity close to the ion velocity. A peak structure has been observed which is dominated by a broad cusp attributed to the zero-energy electron emission in the projectile-centered reference system at the 2S3 excitation threshold of He0. Further narrower peaks have been identified as results of the decay of autodetachment resonant states of He- populated during the collision by three-electron bound-state capture.

AB - The energy spectrum of the electrons ejected in forward direction from Ar atoms with simultaneous bound-state capture of two electrons has been measured by impact of 30 keV/amu He2+ ions with the aim to clarify the discrepancy between the results of two previous experiments concerning the existence of the cusp-shaped peak for electrons with velocity close to the ion velocity. A peak structure has been observed which is dominated by a broad cusp attributed to the zero-energy electron emission in the projectile-centered reference system at the 2S3 excitation threshold of He0. Further narrower peaks have been identified as results of the decay of autodetachment resonant states of He- populated during the collision by three-electron bound-state capture.

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