Collision dynamical information from pressure broadening measurements: Application to carbon monoxide

Self- and helium-broadened carbon monoxide linewidths have been inverted to obtain state-to-state rate constants using the energy corrected sudden scaling formalism. Selected rotation-rotation and rotation-translation rate constants are discussed as a function of vibrational and rotational levels for the CO-CO and He-CO systems. We find that there is no dependence of the collision dynamics upon the vibrational state of the collision partners up to υ=3. In addition, relaxation in both these systems is found to be dominated by rotation-translation collisions. However they are qualitatively different in their dynamical characteristics and result in signficantly varied state-to-state rate constants. An analysis of the effect of collision partners in the CO-X (X=CO, He, Ne, Ar, Xe, H₂) system is presented. Comparisons are made with the available data in the literature.