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Bulletin of the American Physical Society

Effects of spin-exchange collisions on atomic radio-frequency spectroscopy

Chuanpeng Hao, Yuan yue Zhu, Zheru Qiu, Qi Sun, Dong Sheng

Published May 30, 2018• 0 citations
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An effect is demonstrated where off-resonant optical pumping is enhanced by spin-exchange collisions, which enables a high degree of spin orientation to be obtained in alkali-metal atoms. The experiment with room-temperature cesium vapor employs radio-frequency spectroscopy under conditions of the nonlinear Zeeman effect that allow the populations of the individual Zeeman sublevels to be determined. The improved efficiency of atomic orientation leads to a significant reduction of population relaxation out of the state with maximum magnetic quantum number mmm (stretched state), which is observed as a narrowing of radio-frequency resonances. Spin-exchange collisions play a crucial role in this effect although the applied atomic density $\ensuremath{\sim}101010{}^{11}$ cm${}^{\ensuremath{-}3}$ corresponds to collision rates not greater than several tens of Hz. A simplified theoretical model has been developed to reproduce the measurement results numerically.
Radio-frequency spectroscopy of ions has been performed on the (Sr87)+{({\mathrm{Sr}}^{87})}^{+}(Sr87)+, (Cd111)+{({\mathrm{Cd}}^{111})}^{+}(Cd111)+, and (Cd113)+{({\mathrm{Cd}}^{113})}^{+}(Cd113)+ ground states utilizing spin-exchange collisions with optically pumped rubidium atoms for both producing and detecting the orientation.