Abstract
Fast, 1 keV electron–helium collisions performed in an intense ( 4 × 1 0 12 W/cm 2), non-resonant laser field were investigated realizing the first experiment for laser-assisted ionization. The resulting double- and triple-differential cross-sections for the single ionization show significant differences in comparison to the field-free cross-sections. Our quantum-mechanical calculation, using a First-Born approximation (FBA) to describe the collision and Volkov states for the continuum electrons, cannot explain the measured cross-sections.
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