Abstract
We report measurements of the angular distribution of optical suppression in photoassociative ionization collisions taking place within a bright, slow Na atom beam. At a collision “temperature” (T=Ekin/kB) of about 5 mK we observe rich structure in the suppression measure as a function of the angle between the atom-beam axis and the polarization axis of the suppressor light beam. This structure cannot be explained by the superposition of individual partial-wave contributions to the suppression measure, and we propose a partial-wave interference phenomenon to account for it.
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