Journal of Chemical Physics, Vol.100, No.10, 7135-7143, 1994
Vibrational Autoionization in H-2 Above the V(+)=3 Ionization-Limit
We report multichannel quantum defect theory calculations of vibrational branching ratios and photoelectron angular distributions for photoionization of an ortho/para equilibrium mixture of H-2 at 300 K, between wavelengths 762.5 and 765.0 Angstrom. We compare bur results with the 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-calculations and experiment is obtained for branching ratios and angular distributions 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 obtained for the total photoionization cross section.
Keywords:QUANTUM DEFECT THEORY;PHOTOELECTRON ANGULAR-DISTRIBUTIONS;MOLECULAR-HYDROGEN;HIGH-RESOLUTION;PHOTOABSORPTION;PREIONIZATION;H2;PREDISSOCIATION;SPECTRUM