DISSOCIATIVE PHOTOIONIZATION OF H2 FROM 18 TO 124-EV

Absolute cross sections for the production of H+ and H-2+ have been me asured from the dissociative ionization threshold at 18.076-124 eV. A broad resonance occurs in the H+ cross section caused primarily by aut oionization of the Q1 Rydberg states. The absolute cross section for p roducing neutral atoms only is obtained by the use of published photoi onization yield data. It is shown that the sum of the neutral and ioni zed H fragments produce a major resonance representing transitions int o the Q1 and Q2 Rydberg states.