The photoionisation of helium using perturbation theory
- 28 July 1978
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 11 (14) , 2449-2455
- https://doi.org/10.1088/0022-3700/11/14/009
Abstract
Perturbation theory based on the frozen-core Hartree-Fock approximation in zero order is used to calculate the oscillator strength for the 1s2 1S to 1s epsilon p1P photoionisation of helium. The method gives agreement between the dipole-length and dipole-velocity calculations to one part in one thousand. The dipole-acceleration calculations deviate from these by only 1%.Keywords
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