Double photoionization of helium using [ital R]-matrix methods

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.R3573· OSTI ID:7122237

Meyer, K W; Greene, C H ^[1]

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1. Department of Physics and The Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colorado 80309-0440 (United States)

The eigenchannel [ital R]-matrix method for single photoionization is extended to describe a class of two-electron escape processes. We apply this approach to calculate the double photoionization of helium by single-photon absorption for photon energies in the range 80--280 eV. Pseudoresonances in the double continuum are eliminated by performing a Gailitis average and by averaging the final spectrum over the size of the [ital R]-matrix box. Calculations are presented in both the velocity and acceleration gauges. The ratio of double- and single-photoionization cross sections, a key parameter for characterizing electron correlations, is compared to existing theoretical and experimental values.

• OSTI ID: 7122237
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:5; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ACCELERATION
CHARGED PARTICLES
CORRELATIONS
CROSS SECTIONS
ELECTRON CORRELATION
ELECTRON LOSS
ELEMENTS
ENERGY RANGE
EV RANGE
FLUIDS
GASES
HELIUM
IONIZATION
IONS
MANY-BODY PROBLEM
MATRICES
MULTICHARGED IONS
NONMETALS
PHOTOIONIZATION
R MATRIX
RARE GASES
RESONANCE
TWO-BODY PROBLEM
VELOCITY