## Abstract

High-resolution far-ultraviolet broadband Fourier-transform photoabsorption spectra of ^{32}S^{16}O, ^{33}S^{16}O, ^{34}S^{16}O, and ^{36}S^{16}O are recorded in a microwave discharge seeded with SO_{2}. The (Formula presented.) and (Formula presented.) bands are observed or inferred in the (Formula presented.) –51,000 cm^{−1} (196 to 233 nm) spectral range. This is the first experimental detection of a (Formula presented.) level and of any of these observed bands in an S-substituted isotopologue. Additional measurements of (Formula presented.) provide a calibration of the SO column density. Measured band profiles are fitted to an effective-Hamiltonian model of coupled excited B ^{3}Σ^{−} and C ^{3}Π states along with their predissociation linewidths and absorption band strengths. Electronic-state potential-energy curves and transition moments are deduced. The end result is a list of line frequencies, f-values, and dissociation widths describing the far-ultraviolet photodissociation spectrum of SO that is accurate enough for computing atmospheric photolytic isotope-fractionation. Linelists, and photoabsorption and photodissociation cross sections are available as supplementary data.

Original language | English |
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Article number | e2153092 |

Journal | Molecular Physics |

Volume | 121 |

Issue number | 17-18 |

DOIs | |

Publication status | Published - 2023 |

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^{-}− X

^{3}Σ

^{-}and C

^{3}Π − X

^{3}Σ

^{-}band systems of SO sulphur isotopologues'. Together they form a unique fingerprint.