Sensitive Detection of Cold Cesium Molecules Formed on Feshbach Resonances
Sensitive Detection of Cold Cesium Molecules Formed on Feshbach Resonances
We observe the dynamic formation of quasibound ${\mathrm{C}\mathrm{s}}_{2}$ molecules near Feshbach resonances in a cold sample of atomic cesium. Using an external probe beam, more than 15 weakly coupled molecular states are detected with high sensitivity, whose collisional formation cross sections are as small as $\ensuremath{\sigma}=2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}16}\text{ }{\mathrm{c}\mathrm{m}}^{2}$. By modeling the …