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Based on spatially and temporally resolved numerical solutions to the relativistic quantum field equations, we provide a resolution to the controversial issue of how an incoming electron scatters off a supercritical potential step and how the electron-positron pair production is affected by this collision. The treatment of the problem as a correlated three-particle problem suggests revealing insight into the process.

We present the results of high-frequency intense-laser numerical multiphoton experiments on a model atom. These results indicate both suppression of ionization and localization of the atomic electron even after a smooth laser turn on.