A curve-crossing model for He*(23S)+Ne collisions consistent with differential and total scattering cross sections, and quenching rate constants

He*(23S)+Ne differential elastic scattering measurements in crossed supersonic beams over the energy range 0.6–2.8 kcal/mol are combined with total cross section velocity dependence and quenching rate constant temperature dependence to determine a 3×3 potential matrix characterizing a double curve-crossing model for the collision dynamics and energy transfer. The coupled radial Schrödinger equations are integrated numerically to yield the appropriate cross sections. At low energy (E<4 kcal/mol) a mixed adiabatic/diabatic two-state model derived from the potential matrix accurately represents the data. Dynamics in the three-state model, which is topologically similar to non-adiabatic coupling involving charge transfer, is discussed, and the bearing of the model on collisional pumping of the HeNe 1.1 μ laser is assessed.