Final Published Version
Physical Review A
We have studied the ionization of lithium Rydberg atoms by pulsed microwave fields in the regime in which the microwave frequency is equal to or a subharmonic of the classical Kepler frequency of the two-body Coulomb problem. We have observed a series of resonances where the atom is relatively stable against ionization. The resonances are similar to those seen previously in hydrogen, but with significant quantitative differences. We also present measurements of the distribution of states that remain bound after the microwave interaction for initial states near one of the classical subharmonic resonances.
© 2000 by the American Physical Society. The publisher's version of the article can be found at http://journals.aps.org/pra/abstract/10.1103/PhysRevA.62.063401
Michael W. Noel, W. M. Griffith, and T. F. Gallagher, "Classical subharmonic resonances in microwave ionization of lithium Rydberg atoms," Phys. Rev. A. 62, 063401 (2000).