Above-threshold ionization of Rydberg atoms by microwave intensities of 3 ×{} 10⁴ W/cm² produces electrons with kinetic energies of up to 9 eV, corresponding to the absorption of up to 3 ×{} 10⁵ photons. The observations can be described in terms of a classical free electron in an oscillating field, which is the low-frequency limit of more conventional treatments of the phenomenon.
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T. F. Gallagher (1988) studied this question.
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