Abstract
The kinetic energy spectra of fragment protons and deuterons produced in the dissociative photoionization of H 2 and D 2 by 37 eV photons have been measured along the E vector of the radiation. It is shown that the 1 Σ u +(Q 2) superexcited state plays a dominant role in the photoionization process. An analysis of the results provides an experimental estimate of (a) the autoionization lifetime of this state as a function of internuclear separation and (b) the branching ratio for the different autoionization pathways.
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