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Physica D Nonlinear Phenomena

Excited hydrogen atoms in pulsed microwaves: journeys to quantum chaos and back

J. E. Bayfield, S.Y. Luie, Luca Perotti, Miroslaw P. Skrzypkowski

Published May 1, 1995• 18 citations
Publisher
DOI
10.1016/0167-2789(94)00249-p

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Analytical and numerical results are presented on the mechanism of excitation and ionization of hydrogen atoms under microwave fields. In particular the existence is predicted of a critical value of the microwave field, the quantum delocalization border, above which the quantum packet delocalizes and strong excitation and ionization takes place. Below the quantum border, the packet is localized even though the correseponding classical system is chaotic and obeys a diffusion equation. These studies reveal some other unexpected new features of quantum dynamics which aslo could be observed in laboratory experiments and provides a quantum theory for subthreshold ionization. Keywords: Quantum Chaos; Energy Level Statistics; Quantum Kicked Rotator; Anderson Localization; Microwave Excitation of Hydrogen Atoms; Keldish Parameter; Quantum Diffusion; Italy.