Cross sections for J mixing in 8D and 9D states of caesium in collisions with noble-gas atoms

Cross sections for the transfer of excitation between fine-structure sublevels of the 8D and 9D states of caesium due to collisions with noble-gas atoms are measured by the integrated intensities method. The results for the 9D state are in good agreement with the values obtained previously by the time-resolved technique and those for the 8D state are reported for the first time. The final values of the cross sections for the process Cs(n 2 D 3 2/)+A to Cs(n 2 D 5 2/)+A, summarising the authors present and previous measurements, are, for A=He, Ne, Ar, Kr and Xe, respectively, 7.9 (1.3), 2.8 (4), 1.9 (3), 1.4 (2) and 1.4 (2) for n=8, and 7.5 (1.2), 2.4 (4), 2.2 (4), 3.1 (5) and 3.1 (5) for n=9, in units of 10 -14 cm 2 .