Calculation of associative and Penning ionization of H and D by He(2 1S) and He(2 3S)

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Abstract
Associative and Penning ionization cross sections are calculated for collisions of H and D with He(2 1S) and He(2 3S) in the energy range 0.03–1.0 eV. Ab initio configuration–interaction potential curves V* and V+ for these systems are used. For the autoionization width Γ, the recent results of Hickman, Isaacson, and Miller for He(2 3S) ‐H are employed, and their calculations are extended to obtain the width for He(2 1S) –H. For the latter system, the calculated associative ionization fraction and the relative energy dependence of the total ionization cross section are in excellent agreement with the recent experiments of Fort, Laucagne, Pesnelle, and Watel. Comparison with the experiments of Morgner at thermal energies, and of Howard, Riola, Rundel, and Stebbings, and Neynaber and Magnuson at higher energies suggests that Γ (R) for He(2 3S) –H is fairly accurate, and that Γ (R) for He(2 1S) –H is low by about a factor of 2.

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