Strong-field nonsequential double photoionization using virtual-detector theory with path summation

We present an ab initio study of the nonsequential strong-field ionization dynamics a model two-electron atom with helium character. Single- and double-ionization events are characterized displayed using detector signals extracted at different points in two-dimensional space. The double photoelectron momentum distribution is calculated via coherent path-summation over virtual particle trajectories. Insights into electron recollision pathways gained from detailed virtual-particle tracking energy-time readouts. This demonstrates extension theory to multi-electron quantum highlights importance evolving phase quasi-classical propagation.