Shvetsov-Shilovskiy, Nikolay3; Dimitrovski, Darko3; Madsen, Lars Bojer3
1 Department of Physics and Astronomy, Science and Technology, Aarhus University2 Teoretisk naturvidenskab, Aarhus University, Aarhus University3 Department of Physics and Astronomy, Science and Technology, Aarhus University
By comparison with the solution of the time-dependent Schrödinger equation we explore the validity of the two-step semiclassical model for strong-field ionization in elliptically polarized laser pulses. We find that the discrepancy between the two-step model and the quantum theory correlates with situations where the ensemble average of the force deviates considerably from the force calculated at the average position of the trajectories of the ensemble. We identify the general trends for the applicability of the semiclassical model in terms of intensity, ellipticity, and wavelength of the laser pulse, and in terms of the properties of the atomic potential.
Physical Review a (atomic, Molecular and Optical Physics), 2013, Vol 87, Issue 1