Double photoionization of helium usingR-matrix methods
- 1 November 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 50 (5) , R3573-R3576
- https://doi.org/10.1103/physreva.50.r3573
Abstract
The eigenchannel 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 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.Keywords
This publication has 22 references indexed in Scilit:
- Convergent close-coupling calculations of electron-hydrogen scatteringPhysical Review A, 1992
- Probability for double photoionization of He and NePhysical Review A, 1992
- Single-photon double ionization of He and NePhysical Review A, 1992
- One photon double ionization of helium: threshold behaviourThe European Physical Journal D, 1990
- Test of Wannier threshold laws: Double-photoionization cross section in heliumPhysical Review Letters, 1988
- R -matrix theory of electron scattering at intermediate energiesProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1987
- Double photoionization of heliumPhysical Review A, 1981
- Multiple photoionisation in the rare gases from threshold to 280 eVJournal of Physics B: Atomic and Molecular Physics, 1979
- Oscillator strengths for double ionization in the outer shells of He, Ne and ArJournal of Physics B: Atomic and Molecular Physics, 1976
- Double ionization of rare gases. II. Ion formation by photon impactPhysical Review A, 1976