Continuum effects in electron-helium total cross sections
- 14 December 1988
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 21 (23) , 3999-4005
- https://doi.org/10.1088/0953-4075/21/23/017
Abstract
It is shown that total cross sections for the excitation of target states with large spectroscopic factors may be calculated accurately by representing the states by their leading independent-particle configurations. With this approximation coupled-channels calculations agree only qualitatively with experimental total cross sections for the first five states of helium. R-matrix calculations using configuration interaction show better qualitative agreement. The complex polarisation potential for continuum excitations is described for two-electron atoms. When this is included in a coupled-channels optical calculation quantitative agreement with experiment is obtained for most states at 30, 50 and 100 eV.Keywords
This publication has 10 references indexed in Scilit:
- Electron excitation in helium: including the n=4 levels in an R-matrix calculationJournal of Physics B: Atomic and Molecular Physics, 1987
- Electron scattering by atomic hydrogenJournal of Physics B: Atomic and Molecular Physics, 1987
- Electron excitation from the 11S, 23S and 21S states of helium. An eleven-state R-matrix calculationJournal of Physics B: Atomic and Molecular Physics, 1985
- A measurement of the cross section for ionisation of helium by electron impact using a fast crossed beam techniqueJournal of Physics B: Atomic and Molecular Physics, 1984
- Momentum-space coupled-channels optical method for electron-atom scatteringPhysical Review A, 1983
- Ionization: Test of a continuum optical model for electron scatteringPhysical Review A, 1983
- Total cross sections for electron excitation transitions between the 11S, 23S, 21S, 23P and 21P states of atomic heliumJournal of Physics B: Atomic and Molecular Physics, 1981
- The polarisation potential in electron-atom scatteringJournal of Physics B: Atomic and Molecular Physics, 1981
- Continuum in the atomic optical modelPhysical Review A, 1980
- Total cross sections for electron scattering by HeJournal of Physics B: Atomic and Molecular Physics, 1977