Second-Order Distorted Wave Calculation for Electron-Impact Ionization of Helium to He⁺ (N = 1 and 2)
Second-order distorted wave calculations are presented for electron-impact ionization of helium with the residual ion left in the n = 1 and 2 states at intermediate energies in coplanar asymmetric geometry. Whereas previous second-order calculations have used the plane wave Born approximation and have used approximations to simplify the evaluation of the second-order term, we perform a full distorted wave calculation and make no approximations in the evaluation of the second-order amplitude (i.e. we sum over all contributing intermediate states). The triple differential cross sections are compared with experimental measurements.
Z. Chen and D. H. Madison, "Second-Order Distorted Wave Calculation for Electron-Impact Ionization of Helium to He⁺ (N = 1 and 2)," Journal of Physics B: Atomic, Molecular and Optical Physics, Institute of Physics - IOP Publishing, Dec 2005.
The definitive version is available at http://dx.doi.org/10.1088/0953-4075/38/23/003
National Science Foundation (U.S.)
Keywords and Phrases
Atomic Excitation and Ionization; Atomic Physics; Molecular Physics; Stereochemistry
Article - Journal
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