ExoMol molecular line lists - XIV: The rotation-vibration spectrum of hot SO$_2$

TL;DR

This paper presents an extensive line list for hot SO₂, covering a wide spectral range and validated with experimental data, aiding atmospheric and astrophysical research.

Contribution

It provides a comprehensive, empirically-adjusted line list for SO₂'s rotation-vibration spectrum up to 8000 cm$^{-1}$ for temperatures below 2000 K, which was not previously available.

Findings

Line list contains 1.3 billion transitions.

Validated with infrared absorption cross sections at 300 and 500°C.

Coverage up to 8000 cm$^{-1}$ for temperatures below 2000 K.

Abstract

Sulphur dioxide is well-known in the atmospheres of planets and satellites, where its presence is often associated with volcanism, and in circumstellar envelopes of young and evolved stars as well as the interstellar medium. This work presents a line list of 1.3 billion $^{32}$S$^{16}$O$_2$ vibration-rotation transitions computed using an empirically-adjusted potential energy surface and an ab initio dipole moment surface. The list gives complete coverage up to 8000 cm$^{-1}$ (wavelengths longer than 1.25 $\mu$m) for temperatures below 2000 K. Infrared absorption cross sections are recorded at 300 and 500 C are used to validated the resulting ExoAmes line list. The line list is made available in electronic form as supplementary data to this article and at www.exomol.com.