Suppression of Multiphoton Ionization of Rydberg Atoms by Bichromatic Microwave Fields

Abstract

We report theoretical study on ionization suppression of Rydberg atom by bichromatic microwave field. In the framework of one-dimensional classical model we find that with the monochromatic microwave field of (angular) frequency 2 and amplitude 2F one-dimensional Rydberg atom is ionized, while adding the second microwave field of frequency  and amplitude F to the atom subjected to the first microwave field prohibits ionization of the Rydberg atom in case Kepler frequency of the Rydberg atom excited in the state of principal quantum number n, 1/n, nearly matches K/4( +2) with K = 1.