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Benchmark differential cross sections for electron impact excitation of the n = 2 states in helium at near-ionization-threshold energies

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Authors
Hoshina, M.
Kato, H.
Tanaka, H.
Bray, Igor
Fursa, Dmitry
Buckman, S.
Ingolfsson, O.
Brunger, M.
Date
2009
Type
Journal Article

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Hoshino, M and Kato, H and Tanaka, H and Bray, I and Fursa, D. V and Buckman, S. J and Ingolfsson, O and Brunger, M. J. 2009. Benchmark differential cross sections for electron impact excitation of the n = 2 states in helium at near-ionization-threshold energies. Journal of Physics B. 42 (14): pp. 145202.
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Journal of Physics B
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Faculty
Faculty of Science and Computing
School of Science and Computing
Department of Imaging and Applied Physics
Faculty of Science and Engineering
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© Institute of Physics (the “Institute”) and IOP Publishing 2009.

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Abstract

In this paper, we present new normalized experimental differential cross sections for electron impact excitation of the n = 2 states in helium. The incident electrons have energies in the range 23.5-35 eV, while the scattered electrons are detected over the angular range 10-130. Corresponding theoretical results from our convergent close-coupling approach are also presented and in general are in very good accord with our measured data. Where possible, a comparison of the present experimental and theoretical results with those from previous measurements is also made. The case for the n = 2 levels in helium constituting a benchmark cross section data set is examined.