COLLISIONAL BROADENING AND SHIFT OF THE RUBIDIUM D_1 AND D_2 LINES (5~2S_(1/2)→5~2P_(1/2), 5~2P_(3/2)) BY RARE GASES, H_2, D_2, N_2, CH_4 AND CF_4

摘要

The collision induced broadening and line shifts for the Rb D_1 (5~2P_(1/2)-5~2S_(1/2)) and D_2 (5~2P_(3/2)-5~2S_(1/2)) transitions at low buffer gas pressure (0-300 torr) and T = 394 K were obtained from high resolution laser absorption spectra. The shifts, δ, and broadening, γ_L for H_2, D_2, N_2, CH_4 and CF_4 are in MHz per torr δ(5~2P_(1/2))= -2.17, -2.22, -7.41, -7.92, -5.41; δ(5~2P_(3/2))= -3.83, -4.09, -5.79, -7.0, -5.73; γ_L(5~2P_(1/2))= 17.3, 14.1, 16.3, 29.1, 18.7; γ_L(5~2P_(3/2)) = 26.4, 20.6, 18.3, 26.2, 17.3, respectively. Similar results are reported for rare gas collision partners. These values have been further interpreted using the impact approximation for collisional broadening to obtain the parameters for the Leonard Jones interaction potentials. The rates for pressure broadening are clearly correlated with polarizability of the collision partner.