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We demonstrate a hybrid method based on field ionization and state-selectivede-excitation capable of measuring the lifetimes of high-lying Rydberg states.For nS Rydberg states of Rb atoms with principal quantum number $60\leqn\leq88$, we measure both the individual target state lifetimes and those ofthe ensemble of Rydberg states populated via black-body radiation-inducedtransitions. We find good overall agreement with numerical calculations of theexpected lifetimes in both cases. However, for the target state lifetimes, wefind a local deviation towards shorter lifetimes for states around $n=72$,which we interpret as a signature of a modified black-body spectrum in thefinite volume in which our experiments take place.

Measurements of individual and ensemble lifetimes of high-lying Rb Rydberg states