SEMICLASSICAL DYNAMICS OF STRONGLY DRIVEN SYSTEMS

A nonperturbative analytical semiclassical approach describing the int eraction of a quantum system with strong oscillating fields is present ed, including the limit where the external high-frequency field destro ys the classical trajectories of a field-free system. Applied to ioniz ation of a Rydberg atom, our approach allows us to describe the so-cal led ''interference'' and ''adiabatic'' mechanisms of laser-induced sta bilization of atomic Rydberg states in a unified way. [S1050-2947(98)5 0208-9].