Photoabsorption and Compton scattering in ionization of helium at high photon energies

Conference · Tue Dec 14 23:00:00 EST 1993 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5091809

Andersson, L R; Burgdoerfer, J ^[1]

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1. Department of Physics and Astronomy, 401 A. H. Nielsen Bldg., University of Tennessee, Knoxville, Tennessee 37996-1200 (United States) Oak Ridge National Laboratory, Oak Ridge, Tennessee 37931-6377 (United States)

Production of singly and doubly charged helium ions by impact of keV photons is studied. The ratio [ital R][sub [ital ph]]=[sigma][sup ++][sub [ital ph]]/[sigma][sup +][sub [ital ph]] for photoabsorption is calculated in the photon-energy range 2--18 keV using correlated initial- and final-state wave functions. Extrapolation towards asmptotic photon energies yields [ital R][sub [ital ph]]([omega][r arrow][infinity])=1.66% in agreement with previous predictions. Ionization due to Compton scattering, which becomes comparable to photoabsorption above [omega][similar to]3 keV, is discussed

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5091809
• Report Number(s): CONF-9309229--
• Journal Information: AIP Conference Proceedings (American Institute of Physics); (United States), Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Vol. 295:1; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION
ATOM COLLISIONS
BASIC INTERACTIONS
BRANCHING RATIO
COLLISIONS
COMPTON EFFECT
CORRELATIONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTS
ENERGY RANGE
EQUATIONS
FLUIDS
GASES
HELIUM
INTERACTIONS
IONIZATION
KEV RANGE
NONMETALS
PHOTOIONIZATION
PHOTON COLLISIONS
PHOTON-ATOM COLLISIONS
RARE GASES
SCATTERING
SORPTION
SUM RULES