Exact relativistic second Born approximation for electron capture

Abstract
We derive the exact asymptotic behavior of the second Born approximation for electron capture. The transfer probability as a function of impact parameter and the cross section is shown to go like (lnE)2/E, where E is the collision energy. This result is the same as for the impulse approximation, and is independent of the initial- and final-state wave functions. In particular, it is also true for capture to the continuum.

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