Simple modelling of Q-branch absorption-II. Application to molecules of atmospheric interest (CFC-22 and CH₃Cl)

The simple approach developed in a previous paper in order to model absorption by Q-branches is applied to the 2v₆ Q-branch of CFC-22 perturbed by N₂ and to the v₅ ^R Q₀-branch of CH₃Cl perturbed by He. Measurements have been made for these two systems at room temperature for a number of pressures in the 0.05-1.00 atm range. It is shown that our model enables satisfactory prediction of both the pressure and wavenumber dependences of absorption with only six effective parameters; the latter, which depend on temperature only, have been deduced from measured spectra. There values are in satisfactory agreement with results from other sources, except for the average broadening parameter, which is generally underestimated with the model as explained in our previous paper.