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Electrons colliding with spatially fixed ions in strong laser fields are investigated by solving the time‐dependent Schrödinger equation. Considering first simple one‐dimensional model systems, the mechanisms and energy spectra of fast electrons are analyzed, starting from collisions on a single ion. By using these electrons as projectiles for a second and third collision, the maximum possible energy obtained can be significantly increased. We then generalize the analysis to 2D systems where additional angular degrees of freedom lead to a drastic loss of efficiency. This problem can be overcome by introducing external confinements, which allow to focus the electrons and increase the intensity of high‐energy electrons (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Fast Electron Generation by Coulomb Scattering on Spatially Correlated Ions in a Strong Laser Field