Abstract
The direct dissociative recombination (DR) of a diatomic molecular ion, AB+, with an electron is described by AB++e where AB* → AB* A + B is a repulsive state of the neutral molecule which dissociates directly to A and B. The dissociation prevents the emission of an electron by AB* and accounts for the high rate of electron recombination with molecular ions compared to atomic ions. This paper presents a discussion of ab initio calculations of potential energy curves for the AB* and AB+ states in (1). Results for recent large scale calculations for O2 are presented along with additional results for H2 and He2.These calculations provide answers to the following questions: What are the identities of the molecular states responsible for DR? What are the translational energies and states of the resulting atoms? How do the atomic state quantum yields vary with ion vibrational excitation and electron temperature?
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