Temperature and wavelength dependence of the rotational Raman gain coefficient in N2

The temperature, wavelength, and J dependence of the rotational Raman gain coefficient has been determined for the S-branch transitions in N(2). First, the temperature dependence (80-300 K) of the density-broadening coefficients was measured using stimulated Raman spectroscopy. Second, the wavelength dependence (250-600 nm) of the polarizability anisotropy was empirically determined by fitting to the most recent experimental data. These two results were then used to calculate the rotational Raman gain coefficients with accuracies estimated at 5%. At room temperature, the high-density limit of the steady-state gain coefficient of the strongest line, S(10), is 4.8 x 10(-12) cm/W for a Stokes wavelength of 568 nm.