Abstract
Inelastic collisional processes in fine-structure-state mixing have been studied by selective stepwise excitation and observation of the resulting fluorescence during collisions of excited rubidium 6/sup 2/D/sub 5/2/ state atoms with various noble-gas atoms. It is shown that for intermediately excited rubidium atoms the fine-structure-state mixing cross sections are generally p increasing from helium to xenon. The cross sections for the process Rb(6/sup 2/D/sub 5/2/)+A(n /sup 1/S/sub 0/)..-->..Rb(6/sup 2/D/sub 3/2/)+ A(n /sup 1/S/sub 0/)+..delta..E /sup 1/S/sub 0/)+..delta..E have the values sigma/sub fs/( = 2.4 +- 0.9, 3.1 +- 1.2, 2.6 +- 1.0, 5.8 +- 2.2, and 9.3 +- 5.6 in units of 10/sup -14/ cm/sup 2/, where A denotes in sequence any one of the noble gas atoms He, Ne, Ar, Kr, and Xe, respectively. Transfer cross sections for the transfer of excited Rb6 /sup 2/D-state atoms out of the doublet were also determined and are about an order of magnitude smaller than the fine-structure-mixing cross sections.
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