Collisional parameters of the pure rotational R(0) line of CO in N2: Experiment versus theory

Abstract

Line shape of the first rotational transition of the CO molecule perturbed by N${}_2$ collisions was studied beyond the traditional Voigt profile at pressures from 0.1 up to 1500 Torr and temperatures from 238 up to 353 K using two different spectrometers with complementary abilities. Line intensity, shifting, mixing, broadening, and underlying continuum coefficients were retrieved. The experimental speed dependence (SD) broadening parameters and their temperature dependence were compared to the results of the recent quantum scattering calculations showing fair agreement yet pointing to possible necessity of improvement of the theoretical approach to the CO–N${}_2$ collisional system.