Abstract
We experimentally study energy-pooling collision in the Rb–Cs vapourmixture at low densities in a cell. Atoms are excited to Rb(5P1/2)and Cs(6P3/2) states using two single-mode diode lasers. To isolatethe heteronuclear contribution in the fluorescence spectrum, adouble-modulation technique is adopted. The excited-atom density andspatial distribution are mapped by monitoring the absorption of acounterpropagating single-mode diodelaser beam, tuned to Rb(5P1/2→7S1/2) andCs(6P3/2→8S1/2) transitions, respectively, which could betranslated parallel to the pump beams. The excited atom densities arecombined with the measured fluorescence ratios to determine crosssection for the energy-pooling process [i.e. Rb(5P1/2) + Cs(6P3/2) → Cs(8S1/2) + Rb (5S1/2)].The cross section is 3.79×10−14 cm2±45%.
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