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Rydberg atoms are in the focus of intense research due to the peculiarproperties which make them interesting candidates for quantum optics andquantum information applications. In this work we study the ionization ofRydberg atoms due to their interaction with a trapping laser field, and areaction microscope is used to measure photoelectron angular and energydistributions. Reaction microscopes are excellent tools when brandished againstatomic photoionization processes involving pulsed lasers; the timing tied toeach pulse is crucial in solving the subsequent equations of motion for theatomic fragments in the spectrometer field. However, when used in pump-probeschemes, which rely on continuous wave probe lasers, vital information linkedto the time of flight is lost. This study reports on a method in which thestandard ReMi technique is extended in time through coincidence measurements.This is then applied to the photoionization of $^6$Li atoms initially preparedin optically pumped $2^{2}S_{1/2}$ and $2^{2}P_{3/2}$ states. Multi-photonexcitation from a tunable femtosecond laser is exploited to produce Rydbergatoms inside an infrared optical dipole trap; the structure and dynamics of thesubsequent cascade back towards ground is evaluated.

A pump-probe experiment in cw-mode on ionization of Rydberg atoms