A theoretical model is suggested for the calculation of ionization cross sections in heavy particle collisions in the impact parameter formalism, considering the influence of coupling with the important bound states in direct as well as in rearrangement channels in a two-centered atomic state expansion. We solve the relevant time-dependent Schr\"odinger equation by a variational method in the two-state approximation. In the present paper, we calculate total ionization cross sections of a hydrogen atom by 5--300-keV proton impact. The results thus obtained are compared with the measured data and existing theoretical findings.
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Sahoo et al. (1999) studied this question.
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