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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.

journal of physics. b, atomic molecular and optical physics/journal of physics. b, atomic, molecular and optical physics

A fully quantum calculation of broadening and shifting coefficients of the D<sub>1</sub> and D<sub>2</sub> spectral lines of alkali-metal atoms colliding with noble-gas atoms

A fully quantum calculation of broadening and shifting coefficients of the D1 and D2 spectral lines of alkali-metal atoms colliding with noble-gas atoms

A fully quantum calculation of broadening and shifting coefficients of the D₁ and D₂ spectral lines of alkali-metal atoms colliding with noble-gas atoms