Energy partitioning in Ar++O2 collisions at low energies: Analysis of product states by laser-induced predissociation

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Abstract
Combining the versatility of a guided ion beam (GIB) apparatus with a tunable dye laser system, we have studied in detail the ion–molecule reaction Ar++O2→O+2+Ar at collision energies ranging from 0.04 to 3 eV center of mass (c.m.). The results include integral cross sections and product angular distributions. The extracted kinetic energy distributions provide medium resolution information about the energy partitioning, and are indicative of a significant change of the reaction mechanism between 0.05 and 0.5 eV collision energy. Nascent rovibrational state distributions of metastable O+2(a 4Π) products are obtained from 0.5 to 1.4 eV by photofragmentation. In contrast to what is generally expected from charge transfer processes, a preference for excitation of high rotational states at the expense of vibrational states has been observed. The results are discussed qualitatively on the basis of a diatomics-in-molecules (DIM) surface.

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