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Rubidium Rydberg Atoms in Bichromatic Microwave Fields

We present first experimental results on the interaction of rubidium Rydberg atoms with bichromatic microwave fields. The experiments are performed in a regime where the effect of localization of the population distribution is observed for purely monochromatic fields. The second frequency leads to a significant destabilization of the population distribution. The experimental observations are compared to theoretical results.