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The role of target-electronprojectile-electron interactions in projectile-electron loss is examined in the framework of the plane-wave-Born-approximation.The summation over target-electron states, which typically uses the closure approximation, is refined by using a sum rule for stopping power due to Bethe. The resulting expression for the cross section is compared with other modifications of the closure approximation and with the experimental H +H electron-loss section.

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