Glauber amplitude for scattering of electrons by hydrogen atoms: 1s'2s,2p excitations

Abstract

The method proposed by Yates [Chem. Phys. Lett. 25, 480 (1974)] has been extended to the case of 1s'2s,2p excitation of a hydrogen atom by electron impact. An alternative analytical procedure used by Berestetskii, Lifshitz, and Pitaevskii [Quantum Electrodynamics (Pergamon, Oxford, 1982), p. 539] has, however, been adopted for the evaluation of the third term of the Glauber series. In the process Yates's expression for the third Glauber term for electron"hydrogen-atom elastic scattering has been reproduced. The differential scattering cross section for the excitation process has been calculated as suggested by Yates. This cross section is found to be in reasonable agreement in the low-angle region with the exact Glauber results reported by Tai et al. [Phys. Rev. A 1, 1819 (1970)] and by Gien [Phys. Rev. A 20, 1457 (1979)]. © 1988 The American Physical Society.