Resonant dissociative photoionization of H2 and D2

We present a theoretical study of dissociative photoionization of H-2 and D-2 with emphasis on resonant effects through intermediate doubly excited states. The theory coherently includes competition between the different dissociation and ionization channels, and makes use of B-spline functions to represent both the electronic and nuclear motions. We show that strong interference effects between resonant and nonresonant amplitudes are responsible for unidentified peaks observed in recent experimenal works, and that, for photon energies smaller than 28 eV. the various peaks can be explained in terms of a single (1) Sigma(u)(+) doubly excited state. [S1050-2947(98)01102-0].