Abstract
A simple resolution of the electron translation factor problem in the ion-atom collision theory is presented, in which the perturbed stationary states (PSS) are retained but the asymptotic boundary conditions are automatically satisfied without additional adjustment factors. A mathematically consistent theory was formulated previously in terms of the adiabatically distorted cluster states, which is compared here with the PSS to clarify the difficulties involved. The PSS approach is not convenient when corrections of the order of the electron-ion mass ratio are to be included. An improved calculational procedure using a simple electron translation factor without the channel-switching function is suggested.
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