We use the Baranger model to compute collisional broadening and shift rates for the D1 and D2 spectral lines of M + Ng, where M = K, Rb, Cs and Ng = He, Ne, Ar. Scattering matrix elements are calculated using the channel packet method, and non-adiabatic wavepacket dynamics are determined using the split-operator method together with a unitary transformation between adiabatic and diabatic representations. Scattering phase shift differences are weighted thermally and are integrated over temperatures ranging from 100 K to 800 K. We find that predicted broadening rates compare well with experiment, but shift rates are predicted poorly by this model because they are extremely sensitive to the near-asymptotic behavior of the potential energy surfaces. © 2020 The Author(s). Published by IOP Publishing Ltd.
Journal of Physics B: Atomic, Molecular and Optical Physics
Loper, R. D., & Weeks, D. E. (2020). A fully quantum calculation of broadening and shifting coefficients of the D 1 and D 2 spectral lines of alkali-metal atoms colliding with noble-gas atoms. Journal of Physics B: Atomic, Molecular and Optical Physics, 53(20), 205403. https://doi.org/10.1088/1361-6455/abaec3