The first Born approximation, with the prior interaction, is used to calculate the total cross section for the process ${\mathrm{H}}^{+}+\mathrm{He}{\mathrm{}\left(1s\right)\mathrm{}}^2\to \mathrm{H}\mathrm{}\left(1s\right)+{\mathrm{He}}^{++}+e^{-}$. Comparison of calculated with existing experimental values is made to the extent that it is possible. Fair agreement is obtained for an impact energy of 50 keV; however, more refined calculations are needed for complete clarification.

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