Abstract
A simple model of ionization, capable of dealing with arbitrarily strong laser fields, is discussed. A model ``atom,'' consisting of a rectangular well potential of finite depth is perturbed by a train of \ensuremath{\delta} kicks that are alternating in sign. The results of exact (numerical) calculations are compared with those obtained neglecting continuum-continuum transitions. Both the ionization rate and the photoelectron spectra are discussed. Neglecting continuum-continuum transitions leads to good results for the ionization rate which is well approximated by the low-field perturbative expression up to very strong fields. On the contrary photoelectron spectra are sensitive to a detailed form of continuum-continuum matrix elements (both to their singular and regular parts).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
