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We utilize the reconstruction of attosecond beating by interference oftwo-photon transitions (RABBIT) technique to study the phase of a Rabi-cyclingatom using circularly polarized extreme ultraviolet and infrared (IR) fields,where the IR field induces Rabi oscillations between the 2s and 2p states oflithium. Autler-Townes splittings are observed in sidebands of thephotoelectron spectra and the relative phases of outgoing electron wave packetsare retrieved from the azimuthal angle. In this RABBIT scheme, more ionizationpathways beyond the usual two-photon pathways are required. Our results showthat the polar-angle-integrated and polar-angle-resolved RABBIT phases havedifferent behaviors when the XUV and IR fields have co- and counter-rotatingcircular polarizations, which are traced back to the different ionizationchannels according to the selection rules in these two cases and theircompetition relying on the propensity rule in laser-assisted photoionization.

Circularly polarized RABBIT applied to a Rabi-cycling atom