We are concerned by the quantal determination of the far-wing pressure broadening profiles generated by the D₁ and D₂ cesium atomic lines when perturbed by the presence of He atoms in both absorption and emission.
you can try the potentials between a helium ground-state atom and an alkali atom in its ground and lower excited states calculated by J. Pascale, Phys. Rev. A 28, 632 (1983). The potentials were successfully applied for theoretical description of experimental emission spectra of Cs atoms in solid helium: P. Moroshkin, A. Hofer, D. Nettels, S. Ulzega, and A. Weis, J. Chem. Phys. 124, 024511 (2006).