Cross sections for the production of excited He{sup +} ({ital np}){sup 2}{ital P}{sup {ital o}} states by 50{endash}150-keV proton impact on helium

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.54.2116· OSTI ID:383140

Stolte, W C; Bruch, R ^[1]

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1. Department of Physics, University of Nevada, Reno, Nevada 89557-0058 (United States)

Cross sections have been measured for the production of He{sup +} ({ital np}){sup 2}{ital P}{sup {ital o}} states, {ital n}=2,3,4, by proton impact on helium over a projectile velocity range of 1.42{endash}2.45 a.u. (50 {le}{ital E}{le}150 keV). Cross sections were determined by measuring the extreme ultraviolet photons emitted from excited He{sup +} ions. The data indicate a lower energy than expected for the maximum cross section. A comparison of the present results in terms of projectile energy dependance with the cross sections for excitation to He (1{ital snp}){sup 1}{ital P}{sup {ital o}}, ionization, and total electron capture suggests the primary mechanism for the production of excited He{sup +} at low energies is transfer excitation, with ionization excitation being the dominant mechanism at higher energies. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383140
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 54; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
DYNAMICS
ELECTRON CAPTURE
EXCITED STATES
EXTREME ULTRAVIOLET RADIATION
HELIUM
HELIUM IONS
HYDROGEN IONS 1 PLUS
ION-ATOM COLLISIONS
IONIZATION
KEV RANGE 10-100
KEV RANGE 100-1000
PROTON BEAMS
PROTONS