ExoMol line lists-LVI. The SO line list, MARVEL analysis of experimental transition data and refinement of the spectroscopic model

A semi-empirical IR/Vis line list, SOLIS, for the sulphur monoxide molecule ³²S¹⁶O is presented. SOLIS includes accurate empirical rovibrational energy levels, uncertainties, lifetimes, quantum number assignments, and transition probabilities in the form of Einstein A coefficients covering the, and systems and wavenumber range up to 43 303.5 cm^-1 (≥230.93 nm) with J ≤ 69. SOLIS has been computed by solving the rovibronic Schrödinger equation for diatomics using the general purpose variational code Duo and starting from a published ab initio spectroscopic model of SO (including potential energy curves, coupling curves, (transition) dipole moment curves) which is refined to experimental data. To this end, a database of 50 106 experimental transitions, 48 972 being non-redundant, has been compiled through the analysis of 29 experimental sources, and a self-consistent network of 8558 rovibronic energy levels for the X, a, b, A, B, and C electronic states has been generated with the marvel algorithm covering rotational and vibrational quantum numbers J ≤ 69 and v ≤ 30 and energies up to 52 350.40 cm^-1. No observed transitions connect to the (v = 0) state which is required to model perturbations correctly, so we leave fitting the and state UV model to a future project. The SO line list is available at ExoMol from www.exomol.com.