The intensity distribution of K X-ray lines excited in ion-atom collisions is formulated for very asymmetric collisions. At high X-ray energies, the distribution falls off as the (X-ray energy) -11 while around the line centre, it is approximately Lorentzian. For nearly symmetric collisions, the formula describes molecular-orbital X-rays and no purely separated-atom Lorentzian is present.
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R. Anholt (1976) studied this question.
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