Inelastic cross sections inCs(nDJ2)+Cs(6S122)collisions

The inelastic collisional cross sections of the $\mathrm{nD}$ states of Cs are measured by the technique of selective laser excitation and observation of collision-induced fluorescence. The cross sections (in units of ${10}^{-14\mathrm{}}$ ${\mathrm{cm}}^2$) for the fine-structure-changing collisions [i.e., $\mathrm{Cs}\left(n{}_{}{}^2{}_{}{}^{}D_{\frac{3}{2}}^{}{}_{}{}^{}\right)+\mathrm{Cs}\left(6\mathrm{}{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}\right)\to \mathrm{Cs}\left(n{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}\right)+\mathrm{Cs}\left(6\mathrm{}{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}\right)$] for $n$ being 6-10 are 2.7±0.5, 3.7±0.7, 8.6±1.7, 18.4±3.7, and 29.8±6.0, respectively. The cross sections (in ${10}^{-14\mathrm{}}$ ${\mathrm{cm}}^2$) for excitation transfer out of the $\mathrm{nD}$ doublet [i.e., $\mathrm{Cs}\left(n{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}\right)+\mathrm{Cs}\left(6\mathrm{}{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}\right)\to \mathrm{states}\mathrm{other}\mathrm{than} \mathrm{Cs}\mathrm{}\left(\mathrm{nD}\right)\mathrm{}$] for $n$ being 6-10 are 1.1±0.6, 5.3±1.5, 3.6±1.5, 6.3±2.3, and 15.5±4.0, respectively. The fine-structure-changing cross sections are found to be nearly equal to the geometrical cross section $\pi n^{*4\mathrm{}}{a}_0^2$ for all the $\mathrm{nD}$ states studied, except $6D$, whose fine-structure-changing cross section is unusually large.