Abstract
Constructive interference between two important second-order matrix elements is found for positronium (Ps) formation in the 2p state for the reaction e++H(1s)Ps(2p)+H+ with high positron velocity. As a result a shoulder-like structure is formed in the differential cross section near 45' if one considers only these two matrix elements for the 1s-2p amplitude. The corresponding result for Ps formation in the ground state has a sharp minimum at the same angle as shown by McGuire et al (1986). This minimum occurs due to the destructive interference between the corresponding two matrix elements. The author also calculates total cross sections for positronium formation in the 2p state and compares his results with calculations in various approximations. The large discrepancies between second Born results and his earlier results for 1s-1s capture are discussed.
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