Abstract
A saturated-absorption experiment is used to measure the effects of velocity-changing collisions between Kr* metastable atoms (4p/sup 5/5s(3/2)/sub 2/) and He and Ar perturbers. Comparison between experimental profiles and profiles calculated assuming hard-sphere collisions between Kr* and perturber atoms confirms the calculations of Borenstein and Lamb concerning the change of velocity associated with a collision. Furthermore it is found that the rate of velocity-changing collisions is consistent with the predictions of kinetic theory.
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