Internuclear separation dependence of the angular distributions from photoionization of H-2(+)

摘要

Recent experimental and theoretical works examining the double photoionization of H-2 have uncovered surprising changes in the resulting fully differential cross sections as the kinetic energy released to the outgoing protons is varied. In this work, a complementary study is made of the angular distributions arising from the photoionization of H-2(+) at various internuclear separations R. Different internuclear separations correspond to different amounts of kinetic energy released to the exploding protons. We find that the angular distributions for the sigma(g) --> pi(u) transition in H-2(+) are relatively insensitive to changes in R, but that the angular distributions for the sigma(g) --> pi(u) transition display dramatic variations with R. We investigate the underlying mechanisms of these phenomena, and explore the implications of these findings for the double photoionization of H-2.