Shift and broadening of hyperfine components of the first doublet of cesium perturbed by foreign gases

The collision broadening and shift of the hyperfine structure components of the ground-state splitting for the D₁ (8943 {}) and D₂ (8521 {}) cesium lines by noble gases (He, Ne, Ar, Kr, and Xe) and by light molecular gases (H₂ and N₂) under pressures not greater than 150 Torr and at a temperature of 295 K are investigated. The Lennard-Jones (12-6) interatomic potential constants are calculated for these systems, using the semiclassical theory of Lindholm-Foley (for Cs with Ne, Ar, Kr, Xe, and N₂ systems) and the quantum theory of Baranger (for Cs with He and H₂ systems), by comparing with our experimental results in fine structure. These potential constants are employed for the determination of the shift and broadening in hyperfine structure, using the hyperfine theory of collision broadening.