6D2fine-structure mixing in rubidium induced in collisions with ground-state Rb and noble-gas atoms and withN2molecules

The following cross sections for $6{}_{}{}^2{}_{}{}^{}D_{\frac{3}{2}}^{}{}_{}{}^{}\leftrightarrow 6{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}$ fine-structure mixing in Rb, induced in collisions with ground-state Rb and noble-gas atoms and with ${\mathrm{N}}_2$ molecules, have been measured using previously described methods of atomic fluorescence spectroscopy: $Q(6\mathrm{}{}_{}{}^2{}_{}{}^{}D_{\frac{3}{2}}^{}{}_{}{}^{}\to 6{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{})=17.3, 6.6, 6.1, 5.3, 8.5, \mathrm{and} 6.4$; $Q(6\mathrm{}{}_{}{}^2{}_{}{}^{}D_{\frac{3}{2}}^{}{}_{}{}^{}\leftarrow 6{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{})=11.6, 4.5, 4.1, 3.6, 5.5, \mathrm{and} 4.1$, for Rb, He, Ne, Ar, Kr, and ${\mathrm{N}}_2$, respectively, in units of ${10}^{-14\mathrm{}}$ ${\mathrm{cm}}^2$. Upper bounds of cross sections for the effective depopulation of the $6{}_{}{}^2{}_{}{}^{}D$ states were also determined.