State-Resolved Inelastic Cross Sections from CN A 2 Pi v=8 to X 2 Sigma+ v=12: Quenching of the Even-Odd Alternation in the Final Rotational State Populations

摘要

An optical-optical double resonance technique has been employed for the study of collisional transfer from the CN A2Pi v = 8 manifold to X2 Sigma(+) v = 12 with initial and final rotational state resolution. In contrast to our previous studies of v sub A = 7 to v sub X = and v sub A = 7 to v sub X = 11 collisions, no significant even-odd oscillation in the final X state rotational populations was observed for any of the incident A state levels investigated. The absence of this alternation for v sub A = 8 collisions is ascribed to the dependence on CN vibrational coordinate of the off-diagonal matrix element connecting the Sigma and Pi (A') wave functions describing the CN (A,X)-Ar interaction. For all incident V sub A = 8 levels studied, a preference for formation of X state e vs f levels of a given N was observed.