Extension of the exact trajectory model to the case of asymmetric tops and its application to infrared nitrogen broadened linewidths of ethylene
Résumé
The model of exact trajectories involved in a semiclassical computation of (vib)rotational linewidths and shifts is extended to the case of asymmetric top colliders. General expressions for the second-order contributions to the scattering matrix are given which define the pressure broadening and shift of the line. This theoretical approach is tested on the particular case of the infrared ν7 band linewidths of C2H4 broadened by N2 which is frequently required for atmospheric applications. The computed linewidths compare favorably with available experimental data.