Photochemical and thermochemical pathways to S2 and polysulfur formation in the atmosphere of Venus.
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ABSTRACT: Polysulfur species have been proposed to be the unknown near-UV absorber in the atmosphere of Venus. Recent work argues that photolysis of one of the (SO)2 isomers, cis-OSSO, directly yields S2 with a branching ratio of about 10%. If correct, this pathway dominates polysulfur formation by several orders of magnitude, and by addition reactions yields significant quantities of S3, S4, and S8. We report here the results of high-level ab-initio quantum-chemistry computations that demonstrate that S2 is not a product in cis-OSSO photolysis. Instead, we establish a novel mechanism in which S2 is formed in a two-step process. Firstly, the intermediate S2O is produced by the coupling between the S and Cl atmosp
SUBMITTER: Frances-Monerris A
PROVIDER: S-EPMC9338966 | biostudies-literature | 2022 Jul
REPOSITORIES: biostudies-literature
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