Forward-backward electron–proton asymmetry from a two-photon crossing of diabatic states of H[formula omitted] in linearly polarized intense laser field

Abstract

Controlling spatial–temporal overlap between nuclear wave packets propagating on the coupled electronic states with opposite parity by intense laser field leads to a π periodic modulation in the symmetry breaking of the coupled forward–backward electron and proton motions. The most probable directionality of electron and proton moving simultaneously in opposite directions with total electron–proton asymmetry parameter Ae−ptot=0.62 occurs at fixed carrier-envelope phases of ϑ=15° and 195°. Analysis of the time evolution of the nuclear and the electronic-nuclear wave packets on the field-dressed potentials gives rise to newly insightful images of the nonlinear nonperturbative processes for the asymmetrical localization.