COLLISIONAL LINE BROADENING AND LINE SHIFTING IN N-2-CO2 MIXTURE STUDIED BY INVERSE RAMAN-SPECTROSCOPY

Collisional effects in the Raman Q-branch of N2 perturbed by CO2 have been studied by high-resolution stimulated Raman spectroscopy. The Raman spectra recorded in the 0.3-1.0 atm and 295-1000 K pressure and temperature ranges are fitted with a theoretical profile taking into account line broadening, frequency shift and line mixing due to rotational energy transfers. The data at low density are used as basic data for the modeling of rotationally inelastic rates through sets of adjustable parameters. We have used in this study the two main models developed in the last decade and known as modified exponential gap (MEG) and energy corrected sudden (ECS) laws. Experimental spectra recorded at density up to 32 amagat are compared with simulated spectra derived from both models. This constitutes a test for these models which give similar results at low density. © 1990.