INTERFERENCE STABILIZATION: A-AND V-SCHEMES, DYNAMICS OF IONIZATION, INITIAL COHERENT POPULATION OF RYDBERG LEVELS AND QUANTUM PHASE CONTROL OF THE IONIZATION YIELD

摘要

So, in the V-type interference stabilization the yield of photoelectrons depends significantly on phases of the initial population of Rydberg states. With properly chosen phases of the initial Rydberg probability amplitudes, an atom can be made either completely ionized by a sufficiently long laser pulse or almost no ionized at all. Phase distributions of Rydberg probability amplitudes can be created and efficiently controlled in the two-pulse pump-probe scheme of photoionization. In such a scheme the first pulse creates a superposition of Rydberg states stable with respect to photoionization. During the period of time between the two pulses phases of this superposition change in a controllable way. In dependence on the delay time between the pulses, different types (stable or unstable) of Rydberg superposition states arise at the instant of time when the second pulse begins. For this reason, the probability of ionization of an atom by the second pulse depends periodically on the delay time between the pulses and varies in a wide range (approximately from zero to one).