We study theoretically the formation of positronium atoms through electron capture in collisions of positrons impacting on hydrogenlike targets such as He⁺, Li²⁺, and Be³⁺. We obtain the scattering amplitude of the charge-exchange process by using a distorted-wave model derived from the first order of a Dodd and Greider's expansion. We compute differential and total cross sections by using a partial-wave technique. {} 1996 The American Physical Society.
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