Abstract
The elastic and inelastic electron and positron scatterings from metastable hydrogen H(2s) are calculated by using the Wallace and Glauber approximations [Phys. Rev. Lett. 27, 622 (1971); Ann. Phys. (N.Y.) 78, 190 (1973); Lectures in Theoretical Physics, edited by W. F. Brittin (Interscience, N.Y. 1959), Vol. 1, pp. 315--414]. The general expressions for the Wallace amplitude, which are valid for any s-s and s-p collision process, are given. A comparison of the results of angular distributions for electron and positron scatterings from the metastable 2s state of hydrogen reveals some significant differences in their behavior when compared to the case of scattering from the ground 1s state.
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