A process, called photo-associo-dissociative ionization (PADI), that is related to both photo-association and Penning ionization is presented. As in photo-association, two colliding atoms are excited together as a quasi-molecule. Unlike photo-association, the final photon in the process then excites the molecule to a dissociative curve above the ionization threshold. Experimental measurements of PADI reaction rates, relative to other cold collision rates, are given and dissociation energy distributions are shown.
This work was supported by the
Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences,
Office of Science, U.S. Department of Energy.
Submitted to DAMOP, May 2006 in Knoxville, TN.
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