Quasiperiodic nondipole ionization dynamics in the x-ray stabilization regime
The study investigated how XUV laser pulse duration affects atomic ionization yield in a nondipole regime. It found that this yield modulates quasiperiodically because slow oscillations of the ionized electron wave packet, caused by Coulomb forces, occur during the interaction. This reveals a previously unexplored nonlinear mechanism important for future x-ray free-electron laser facilities.