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The spin-orbit autoionization dynamics of a Rydberg electron wave packet in Ar have been investigated using time-dependent multichannel quantum defect theory (TD-MQDT). The time-dependent photoionization cross sections reveal interesting interference patterns in the recurrence spectra which can be accounted for in terms of the quantum defects of the autoionizing channels. An expression for the time- and energy-dependent asymmetry parameter β(E,t) has been derived to calculate time-resolved photoelectron angular distributions (PADs) for the first time. An oscillation in the time-resolved PAD is observed, with a period which is inversely proportional to the difference between the quantum defects of the autoionizing channels.

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A nano-stabilization technique is developed for the observation of Ramsey fringes in low repetition rate Rydberg electron wavepacket experiments. The stabilization system consists of a CCD array monitoring optical interference fringes of a reference CW laser beam passing through a Michelson interferometer, a PID feedback circuit generating an error voltage, and a piezo responding to the error voltage to compensate for geometric fluctuations in the interferometer of nm with a response time ms. The proficiency of the stabilized interferometer is demonstrated in an experiment to observe Ramsey fringes in autoionizing Rydberg states of Xe.