Single ionization of He by low-velocity protons and C{sup 6+}: Ejected electron momentum distributions

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.54.1394· OSTI ID:286618

Kravis, S D; Abdallah, M; Cocke, C L; Lin, C D; Stockli, M; Walch, B; Wang, Y D ^[1]; Olson, R E ^[2]; Rodriguez, V D ^[3]; Wu, W; Pieksma, M ^[4]; Watanabe, N ^[5]

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1. J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506 (United States)
2. Laboratory for Atomic and Molecular Research and Physics Department, University of Missouri--Rolla, Rolla, Missouri 65439 (United States)
3. Departmento de Fisica, Universitad de Buenos Aires, 1428 Buenos Aires (Argentina)
4. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
5. The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-01 (Japan)

A technique for electron spectroscopy which yields full two-dimensional momentum distributions for continuum electrons has been used to study ejected electrons from single ionization of He by C{sup 6+} and proton projectiles at low velocities. Projectile velocities of 1.63, 1.38, and 1.16 a.u. for C{sup 6+} and 2.39, 1.71, 1.15, .85, and 0.63 a.u. for protons were used. All spectra show much broader distributions along the beam than transverse to the beam. For the case of proton bombardment, the spectra are strongly influenced by both target and projectile potentials, maximizing near the velocity of the saddle in the potential between the two receding ion cores for the lowest projectile velocities. For C{sup 6+} projectiles, the spectra appear to be dominated by the projectile potential and the center of the distribution is strongly shifted toward the projectile velocity. Theoretical results from the continuum-distorted-wave{endash}eikonal-initial-state and classical-trajectory{endash}Monte Carlo methods are in rather good agreement with the proton data but do not agree well with the C{sup 6+} data. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 286618
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 2 Vol. 54; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COPPER IONS
ELECTRON SPECTROSCOPY
HELIUM
ION-ATOM COLLISIONS
IONIZATION
MULTICHARGED IONS
PROTON BEAMS