PRESSURE BROADENING OF VIBRATIONAL RAMAN LINES IN N-2 AT TEMPERATURES BELOW 300-K

Using quasi-cw stimulated Raman gain spectroscopy, the pressure broadening coefficients for the N-2 vibrational Q-branch transitions have been measured over the temperature range 113-297 K for the rotational components J = 4, 6, 8, 10, and 12. The experimental results are fit to a simple power law to give an empirical formula for the temperature dependence of the pressure broadening over the 100-300 K range. These results are also compared to previously published scaling laws that are based on collision induced rotational transition rates.