Electron impact excitation of hydrogenic ions in a modified Coulomb-Glauber approximation
S N Singh; M K Srivastava; S Kumar; S N Singh; Dept. of Phys., Univ. of Roorkee, Roorkee, India; M K Srivastava; Dept. of Phys., Univ. of Roorkee, Roorkee, India; S Kumar; Dept. of Phys., Univ. of Roorkee, Roorkee, India
Журнал:
Journal of Physics B: Atomic and Molecular Physics
Дата:
1979-07-28
Аннотация:
The Coulomb-Glauber approximation is modified to overcome the inadequate semiclassical treatment of close encounter collisions. This modified approach is applied to 1s-2s and 1s-2p excitation of He<sup>+</sup> by electron impact in the energy range 100-1000 eV and is found to affect the cross section in the intermediate and large scattering-angle region. The integrated cross section however remains almost unchanged. The scaled cross sections Z<sup>4</sup> sigma for the n=2 excitation of hydrogenic ions are evaluated in the energy range 25Z<sup>2</sup>-250Z<sup>2</sup> eV and are compared to the second-order potential model of Bransden and Noble (1976), the Coulomb-Born approximation of Tully (1973), and the DWPO model of McDowell et al. (1977).
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