ExoMol molecular line lists XXXVI: $X{}^2\Pi -X{}^2\Pi$ and $A{}^2{\Sigma }^{+}-X{}^2\Pi$ transitions of SH

Abstract

The GYT line list covering rotational, rovibrational and rovibronic transitions of the mercapto radical SH is presented. This work extends and replaces the SNaSH line list [Yurchenko et al., 2018, 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., 2018, AJ., 156, 283]. 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 $A$ ${}^2{\Sigma }^{+}$ states and to the $A$ ${}^2{\Sigma }^{+}$ - $X$ ${}^2\Pi$ band system using ab initio curves as a starting reference point. The fits are compatible with the quoted uncertainty of the experimental data used of $\sim$ 0.03 - 0.3 cm${}^{-1}$. The GYT line list covers wavelengths longer than 0.256 $\mu$m and includes 7686 rovibronic states and 572 145 transitions for ${}^{32}$SH. Line lists for the ${}^{33}$SH, ${}^{34}$SH, ${}^{36}$SH and ${}^{32}$SD isotopologues are generated including a consideration of non-Born-Oppenheimer effects for SD. The line lists are available from the CDS (http://cdsarc.u-strasbg.fr) and ExoMol (www.exomol.com) data bases.

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