Effect of the atomic potential in the distribution of emitted electrons for single ionization by short-laser pulses

D. G. ARBÓ, J. E. MIRAGLIA, M. S. GRAVIELLE, S. YOSHIDA, K. TőKÉSI, K. SCHIESSL, E. PERSSON Y J. BURGDÖRFER

Dresden, Alemania

Workshop; International Workshop on Attosecond Physics; 2007

Max Planck Institute for the Physics of Complex Systems

The interaction of few-cycle laser pulses with matter has attracted considerable interest as increasingly shorter pulses became available. Since Rudenko et al. [1] and Maharjan et al. [2] presented fully two-dimensional momentum maps for laser-ionized electrons for different rare gas atoms, some theoretical attempts have been performed to interpret the experimental data [3,4]. A theoretical study of atomic single ionization driven by a linearly polarized short laser pulse within the single electron approximation is presented. A simple semiclassical analysis of the interference pattern in the angular distribution can be performed in the tunneling regime: The electron released with low momentum experiences Ramsauer-Townsend interference processes displaying a near-threshold axial shape structure. A simple universal classical formula that predicts the dominant angular momentum for tunnel-ionized slow electrons propagating in the combined Coulomb and laser fields is found [3]: , where Z is the core charge,  the electron quiver amplitude, F0 the electric field amplitude and w the laser frequency (in a.u.). I will also show recent investigations on the effect of the Coulomb potential of the atomic core on the dynamics of the detached electron making use of a time-dependent distorted-wave theory – the Coulomb-Volkov approach [5].