THEORY OF 2-COLOR PUMP-PROBE DETERMINATION OF IONIZATION DYNAMICS

We show, through numerical simulations, that it is, in principle, poss ible to follow in time the structure and the population dynamics of an atomic system ''dressed'' by a strong time-varying laser field. The p roposed time-resolved spectroscopy scheme exploits the properties of t he currently developed sources of coherent extreme ultraviolet radiati ons, generated via high-order harmonic conversion. With pulse duration s within the femtosecond range, it is possible to conceive two-color p ump-probe schemes that would help to shed light on issues currently un der discussion about the dynamics of strong-field photoionization.