It has been shown using the molecules CO2 and CO as an example that if the change of the velocity (Δν=Ιν(i)-v(f)Ι) of the absorbing molecule in the quantum transition from the state i to the state f is at a level of 0,2 • 104 cm/s, then the results of calculation of the parameters of the half–width γ and the shift δ of the spectral lines based on the refined Anderson–Tsao–Curnutte–Frost (RATCF) model in terms of the velocity v(i, f) averaged over the states i and f lie within the limits of the experimental error obtained for the functional dependence f(v(i), v(f)).