Abstract
In this paper we treat by entirely ab initio methods, a number of phenomena in nonlinear dynamics in intense laser fields. In particular, we apply the recently developed Floquet-coupled-channel (FCC) method to investigate the phenomenon of adiabatic stabilization and formation of stabilization windows in hydrogen atom, as well as the frequency and intensity dependence of nonlinear-detachment process in hydrogen negative ion. Moreover, a solution is given, with examples, to the methodological problem of consistently evaluating the ATI-spectrum within the Floquet theory. Next, direct simulations are carried out to determine the influence of stabilization on the ATI-spectrum and on the bound state occupation probabilities of H-atom. Finally, the time-scale of formation of ATI-peaks is investigated and shown to be of the order of the rise-time of the pulse.
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