TIME-RESOLVED PHOTOELECTRON ANGULAR-DISTRIBUTIONS - A NONPERTURBATIVETHEORY

We describe a quantum mechanical framework for the calculation of angl e-and energy-resolved photoelectron flux in pump probe scenarios. The theory spans the limits of weak-to-strong field-matter interaction ran ge and the ladder of transitions to al!angular momentum states. It all ows insight into the type of information that can be extracted from ti me-resolved photoelectron distributions with regard to the wavepacket dynamics in the probed manifold. In the strong pump case it suggests t he possibility of gaining insight also regarding the ionization dynami cs, complementary to that extracted from weak-field CW studies. Variou s limits and several averaged observables are discussed and an efficie nt computational method is suggested. (C) 1997 American Institute of P hysics.