Abstract
We report on an experimental study of dissociative photoionization and neutral dissociation of by two-photon excitation from single rotational states (photon energy ). The B-state rovibrational levels are excited in the same light pulse by three-photon absorption from . Angle resolved photoelectron and ion kinetic energy distributions allow us to discriminate between the different decay channels. Neutral decay is detected by one-photon ionization of excited atomic hydrogen product states. The kinetic energy distribution of photoelectrons from dissociative photoionization shows an oscillatory structure which depends on the initial B-state rotational quantum number J. An indication of a corresponding structure in the ion kinetic energy distributions is only found for J = 0. Similar to results reported by Verschuur et al we find neutral decay preferentially into high principal quantum number atomic states. The results indicate that the doubly excited states play a crucial role in the decay processes.
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