Experimental evaluation of the cross-sections for the Cs(6D) → Cs(7PJ) and Cs(6D5 / 2) → Cs(6D3 / 2) collisional transfer processes induced by He and Ar

The cross-sections for collisional excitation transfer Cs ⁡ ( 6 ⁢ D ) → Q D ⁢ 3 Cs ( 7 P 1 / 2 ) and Cs ⁡ ( 6 ⁢ D ) → Q D ⁢ 4 Cs ( 7 P 3 / 2 ) , and fine structure mixing Cs ( 6 D 5 / 2 ) → Q 65 Cs ( 6 D 3 / 2 ) due to collisions with helium and argon atoms at temperatures in the range between 333 and 367 K were determined using atomic fluorescence. The cross-sections for the processes Cs(6D) + He, Ar → Cs(7PJ) + He, Ar were found to be QD3He = (0.9 ± 0.4) × 10− 16 cm2, QD4He = (2.6 ± 1.2) × 10− 16 cm2, QD3Ar = (1.2 ± 0.6) × 10− 18 cm2 and QD4Ar = (2.6 ± 1.3) × 10− 18 cm2. These values are consistent with the results obtained at higher temperatures and reported previously. The cross-sections for the He and Ar-induced 6DJ fine-structure mixing were determined to be Q65He = (54 ± 15) × 10− 16 cm2 and Q65Ar = (17 ± 5) × 10− 16 cm2 and were found to fit very well into the existing body of cross-section data for intra-multiplet (nP1 / 2 → nP3 / 2; nD5 / 2 → nD3 / 2) mixing in cesium induced by collisions with helium and argon.