ExoMol molecular line lists – XLII. Rovibronic molecular line list for the low-lying states of NO

Abstract

ABSTRACT An accurate line list, called XABC, is computed for nitric oxide which covers its pure rotational, vibrational and rovibronic spectra. A mixture of empirical and theoretical electronic transition dipole moments are used for the final calculation of 14N16O rovibronic $\mathrm{A}\, ^2\Sigma ^+$ – $\mathrm{X}\, ^2\Pi$, $\mathrm{B}\, ^2\Pi$ – X2Π, and $\mathrm{C}\, ^2\Pi$ – $\mathrm{X}\, ^2\Pi$ which correspond to the γ, β, and δ band systems, respectively, as well as minor improvements to transitions within the $\mathrm{X}\, ^2\Pi$ ground state. The work is a major update of the ExoMol NOname line list. It provides a high-accuracy NO ultraviolet line list covering the complicated regions where the $\mathrm{B}\, ^2\Pi$-$\mathrm{C}\, ^2\Pi$ states interact. XABC provides comprehensive data for the lowest four doublet states of NO in the region of λ > 160 nm ($\tilde{\nu } \lt 63~000~\mathrm{cm}^{-1}$) for the analysis of atmospheric NO on Earth, Venus, or Mars, other astronomical observations and applications. The data are available via www.exomol.com.