Abstract

Using ultrafast laser excitation and time-correlated single-photon counting techniques, we have measured the collisional mixing rates between the rubidium 52P fine-structure levels in the presence of He4 gas. A nonlinear dependence of the mixing rate with He4 density is observed. We find Rb fine-structure transfer is primarily due to binary collisions at He4 densities of 1019cm3, while at greater densities, three-body collisions become significant. We determine a three-body collisional transfer rate coefficient (52P3/252P1/2) of 1.25(9)×1032cm6/s at 22°C.

© 2010 Optical Society of America

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