VIBRATIONAL AUTOIONIZATION IN H-2 ABOVE THE V(-LIMIT()=3 IONIZATION)

We report multichannel quantum defect theory calculations of vibration al branching ratios and photoelectron angular distributions for photoi onization of an ortho/para equilibrium mixture of H-2 at 300 K, betwee n wavelengths 762.5 and 765.0 Angstrom. We compare bur results with th e recent synchrotron measurement of these observables by Dehmer et al. [J. Chem. Phys. 97, 7911 (1992)], and the total photoionization cross sections measured by Dehmer and Chupka [J. Chem. Phys. 65, 2243 (1976 )]. Except in the region of autoionizing resonances which compete with a dissociation channel, semiquantitative agreement between-calculatio ns and experiment is obtained for branching ratios and angular distrib utions for the v(+) = 0-2 levels, and for the v(+) = 3 branching ratio . However, the level of agreement between the present calculations and the synchrotron measurements is significantly worse than that obtaine d for the total photoionization cross section.