ExoMol line list XXXIV. SH

This work extends and replaces the SNaSH line list (Yurchenko et al., 2018, Cat. J/MNRAS/478/270) which covers the ground (electronic) X ^2^{Pi} state only.

This extension is prompted by the tentative identification of the ultra-violet features of SH as being of importance in the transmission spectrum of the ultra-hot Jupiter exoplanet WASP-121b (Evans et al., 2018AJ....156..283E). This GYT line list model is generated by fitting empirical potential energy, spin-orbit and electronic angular momenta functions to experimentally measured wavelengths within the X ^2^{Pi} and A ^2^{Simga}^+^ states and to the A ^2^{Sigma}^+^ - X ^2^{Pi} band system using ab initio curves as a starting reference point.