15min:

S. B. BAYRAM, R. MARHATTA, P. KOIRALA AND M. BRIEL, Miami University, Physics Department, Oxford, OH 45056.

We have experimentally investigated the anisotropy-dependent polarization spectra for the ¹³³Cs 6s²S_1/2 6p²P_3/2 10s²S_1/2 transition using a two-photon two-color pulsed pump-probe technique. In the investigation, circular and linear polarization degrees were measured to extract the anisotropy-dependent depolarization cross sections in the excited 6p²P_3/2 level cesium atoms due to collisions with the ground-level argon atoms over the Zeeman coherences. We also studied anisotropy oscillations during the pump-probe overlap time in the excited state cesium due to the coupling of nuclear momentum to the electronic angular momentum. The spectra show strong depolarization of the 6p²P_3/2 level and the values for the measured depolarization cross sections are in good agreement with experiment and theoretical predictions.