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- W1972311257 abstract "Select meteoritic classes possess mass-independent sulfur isotopic compositions in sulfide and organic phases. Photochemistry in the solar nebula has been attributed as a source of these anomalies. Hydrogen sulfide (H 2 S) is the most abundant gas-phase species in the solar nebula, and hence, photodissociation of H 2 S by solar vacuum UV (VUV) photons (especially by Lyman-α radiation) is a relevant process. Because of experimental difficulties associated with accessing VUV radiation, there is a paucity of data and a lack of theoretical basis to test the hypothesis of a photochemical origin of mass-independent sulfur. Here, we present multiisotopic measurements of elemental sulfur produced during the VUV photolysis of H 2 S. Mass-independent sulfur isotopic compositions are observed. The observed isotopic fractionation patterns are wavelength-dependent. VUV photodissociation of H 2 S takes place through several predissociative channels, and the measured mass-independent fractionation is most likely a manifestation of these processes. Meteorite sulfur data are discussed in light of the present experiments, and suggestions are made to guide future experiments and models." @default.
- W1972311257 created "2016-06-24" @default.
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- W1972311257 creator A5033894707 @default.
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- W1972311257 creator A5071703421 @default.
- W1972311257 date "2013-02-19" @default.
- W1972311257 modified "2023-10-17" @default.
- W1972311257 title "Sulfur isotopic fractionation in vacuum UV photodissociation of hydrogen sulfide and its potential relevance to meteorite analysis" @default.
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- W1972311257 doi "https://doi.org/10.1073/pnas.1213150110" @default.
- W1972311257 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3816456" @default.
- W1972311257 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23431159" @default.
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