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We report experimental measurements of the rates of blackbodyradiation-induced transitions between high-lying (n>60) S, P and D Rydberglevels of rubidium atoms in a magneto-optical trap using a hybrid fieldionization and state-selective depumping technique. Our results revealsignificant deviations of the measured transition rates from theory forwell-defined ranges of the principal quantum number. We assume that the mostlikely cause for those deviations is a modified blackbody spectrum inside theglass cell in which the magneto-optical trap is formed, and we test thisassumption by installing electrodes to create an additional microwave cavityaround the cell. From the results we conclude that it should be possible to usesuch external cavities to control and suppress the blackbody radiation-inducedtransitions.

Measurements of blackbody radiation-induced transition rates between high-lying S, P and D Rydberg levels