Abstract
The influence of a superposed offset field on the response of very-high-n Rydberg atoms to a sequence of impulsive perturbations provided by a train of (N ⪅ 40) short unidirectional electric field pulses is investigated. Each pulse, termed a half-cycle pulse (HCP), has a duration Tp ≪ Tn, where Tn is the classical electron orbital period. The presence of the offset field leads to dramatic changes in the survival probability, this peaking when the net average field experienced by the atom is zero. The physical mechanisms responsible for this are discussed with the aid of classical trajectory Monte Carlo simulations. Good agreement between theory and experiment is observed.
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