Effects of autoionizing states on two-photon double ionization of the H2 molecule

[摘要] Treating the effects of autoionizing intermediate states on two-photon double ionization (DI) of the H2molecule using time-dependent laser pulses is a significant computational challenge. Relatively long exposure times are critical to understanding the dynamics. Using the fixed-nuclei approximation, we demonstrate how the doubly excited states enhance the angle-integrated generalized cross sections in H2, and how they affect the angular distribution pattern of the ejected electrons. As the energy approaches the threshold for sequential DI, there is a sharp rise in the cross section due to virtual sequential ionization.

[发布机构] Department of Physics and Astronomy, Drake University, Des Moines; 50322, United States^1;Division of Advanced Cyberinfrastructure, National Science Foundation, Arlington; VA; 22230, United States^2;Texas Advanced Computer Center, University of Texas at Austin, Austin; TX; 78758, United States^3

[关键词] Autoionizing state;Computational challenges;Doubly excited state;Fixed-nuclei approximation;Generalized cross section;Intermediate state;Sequential ionization;Two-photon double ionization