The use of second-order potentials in the theory of scattering of charged particles by atoms. VIII. The excitation of the n=3 levels of helium by electron and proton impact
- 11 May 1975
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 8 (7) , 1088-1094
- https://doi.org/10.1088/0022-3700/8/7/014
Abstract
For pt.VII see abstr. A47875 of 1974. Cross sections for the excitation of helium from the ground state to the 31S, 31P and 31D levels, by electrons with energies in the range 100 to 1000 eV and by protons with energies in the range 50 to 1000 keV, have been calculated in a distorted wave approximation. The wavefunction in the incident channel was taken from a previous calculation employing a second-order effective potential and in the final state the effect of coupling between the n=3 levels was included. In the case of excitation of the 31D level, it is shown that transitions via the 21P intermediate state are important over the whole range. The calculated values are compared with those obtained from experiment and generally satisfactory agreement was found.Keywords
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