The excitation of ground-state hydrogen atoms to the 2s state by the impact of electrons with energies of 1 to 50 Ry (13.6 to 680.3 eV) has been calculated in the distorted-wave approximation with exchange included. The angular distributions of the scattered electrons at 1 and 4 Ry are compared with those derived from the close-coupling calculations by Burke, Schey, and Smith, and are compared with four different plane-wave theories at all energies calculated. Taking the close-coupling results as a standard, it is found that the distorted-wave angular distributions represent an improvement over those of the plane-wave theories.
W. N. Shelton et al., "Excitation of the 2s State of Atomic Hydrogen by Electron Impact in the Distorted-Wave Approximation - Angular Distributions," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 3, no. 1, pp. 242-250, American Physical Society (APS), Jan 1971.
The definitive version is available at https://doi.org/10.1103/PhysRevA.3.242
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© 1971 American Physical Society (APS), All rights reserved.