Electron impact ionization of helium: coplanar, triply differential cross sections at high and intermediate energies
- 14 April 1992
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 25 (7) , 1577-1590
- https://doi.org/10.1088/0953-4075/25/7/026
Abstract
The authors calculate the triply differential cross section (TDCS) for electron impact ionization of helium in the coplanar (Ehrhardt-type) geometry with asymmetric excess energy partitioning. The impact energy of the projectile electron is six to twenty-four times larger than the ionization potential. In generating the state functions they generalize the approach of Brauner et al. (1989) who introduced a two-electron-continuum wavefunction for electron impact ionization of hydrogen which incorporates the electron-electron repulsion and all electron-nucleus interactions. This wavefunction gives the exact repulsion three-body Coulomb boundary condition in the limit of large particle separation. In the authors' application to helium, they account for the distortion of the He+-core by introducing phase shifts for the slow, ejected electron.Keywords
This publication has 20 references indexed in Scilit:
- Triply-differential cross sections for ionization of helium by electronsJournal of Physics B: Atomic, Molecular and Optical Physics, 1991
- On the electron impact ionization of H (1s) in coplanar asymmetric geometryJournal of Physics B: Atomic, Molecular and Optical Physics, 1991
- An improved Born approximation for the electron impact ionization of atomic hydrogenThe European Physical Journal D, 1990
- Triply-differential cross sections for ionisation of hydrogen atoms by electrons and positronsJournal of Physics B: Atomic, Molecular and Optical Physics, 1989
- Triple differential cross sections for electron impact ionisation of atomic hydrogen-a coupled pseudostate calculationJournal of Physics B: Atomic and Molecular Physics, 1987
- Triple differential cross sections for electron impact ionisation of helium by fast electronsJournal of Physics B: Atomic and Molecular Physics, 1986
- Eikonal-Born series theory of (e, 2e) reactions in atomic hydrogenJournal of Physics B: Atomic and Molecular Physics, 1985
- Triple differential cross sections for the ionization of atomic hydrogen by fast electronsPhysics Letters A, 1983
- On the second Born approximation for the ionisation of atomic hydrogen and helium by fast electronsJournal of Physics B: Atomic and Molecular Physics, 1982
- Correlation Effects in Atoms. I. HeliumPhysical Review B, 1966