Trajectory surface-hopping study of electronically inelastic collisions of CN(A 2Π) with He: Comparison with exact quantum calculations

The trajectory surface-hopping procedure recently introduced by Parlant and Gislason [J. Chem. Phys. 91, 4416 (1989)] is used to calculate rotationally resolved state-to-state cross sections for the energy transfer between the 2Π3/2 and 2Π1/2 fine-structure rotational manifolds of the A electronic state of CN induced by collision with He at thermal collision energy. Quantum scattering calculations for the same process are also reported. The results obtained by both techniques are compared and found to be in encouraging agreement.