Exponential distorted-wave approximation for charge transfer in collisions of multicharged ions with atomic hydrogen

Abstract

A new theoretical approach named the exponential distorted-wave approximation (EDWA) is developed and applied to electron-capture processes of multicharged ions from a hydrogen atom. The EDWA is an improvement of the unitarized distorted-wave approximation (UDWA) in that the EDWA takes into account the couplings among the final states which are neglected in the UDWA. The difference between the cross sections of the two methods is small except for the low-energy region less than a few keV/amu, and it is confirmed that the mixing among the final rearranged states does not play an important role in the processes studied here.