Knowledge Bank

Abstract-Spectra of nitrous oxide at $0.005cm-1$ spectral resolution have been recorded with the 1m FTIR spectrometer at the National Solar Observatory in Kitt Peak, AZ. From a least-squares fit of individual transitions to a general Voigt profile, line intensities, band strengths, and Herman-Wallis factors have been derived for the $\nu 2$ fundamental and the three strongest hotbands (PR-transitions)of $2\nu 22e\leftarrow \nu 21e,2\nu 22f\leftarrow \nu 21f$, and $2\nu 21e\leftarrow \nu 1e2$. The major contribution to the Herman Wallis factors is due to a Coriolis-type interaction with $\nu 3$, but part of the measured Herman-Wallis factors in the hotbands can be attributed to $\ell$-resonance mixing effects in the $2\nu 2$ $manifold.3$ These measurements are the first reported to be obtained under high resolution. From $N2-$ and $He-$ foreign gas broadened data, broadening coefficients and pressure shifts have been derived and fitted to an energy-gap sealing law. $N2O$ is an important tropospheric molecule and the intensity information provided should also prove useful for Direct Numerical Diagonalization (DND) $calculations.4$