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Electronic Spectra of Carbonyl Sulfide Sulfur Isotopologues

Colussi, Agustín J. and Leung, Fok-Yan and Hoffmann, Michael R. (2004) Electronic Spectra of Carbonyl Sulfide Sulfur Isotopologues. Environmental Chemistry, 1 (1). pp. 44-48. ISSN 1448-2517. doi:10.1071/EN04010.

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Carbonyl sulfide (OCS), a relatively inert tropospheric species that photolyzes into CO + S upon reaching the stratosphere, is deemed a significant contributor to background sulfate aerosol. A recent analysis of atmospheric infrared transmittance data has revealed that OC^(34)S is preferentially depleted above ~10 km. We now report that the OC^(34)S absorption band between 200 ≤ λ [nm] ≤ 260 at 298 K is broader and more intense than its OC^(32)S counterpart. This finding is consistent with the faster photolysis of OC^(34)S, and with a time-dependent formulation of electronic spectra. Since OCS photolysis in the lower stratosphere occurs in a spectral range in which its absorption cross-section is unaffected by temperature, we are able to estimate a ^(34)S-enrichment factor <^(34)ε> ~ (67 ± 7)‰ for this process that is commensurate with the value previously inferred from OC^(34)S/OC^(32)S ratio versus altitude profiles.

Item Type:Article
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URLURL TypeDescription
Colussi, Agustín J.0000-0002-3400-4101
Hoffmann, Michael R.0000-0001-6495-1946
Additional Information:© 2004 CSIRO. Manuscript received: 14 March 2004. Final version: 9 May 2004. We thank Kyle Bayes and Stanley Sander (JPL), and Nathan Dallcska (Caltech) for valuable experimental assistance.
Subject Keywords:atmospheric chemistry — isotopes — carbonyl sulfide — stratospheric sulfate aerosol — photodissociation
Issue or Number:1
Record Number:CaltechAUTHORS:20150803-161142204
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Official Citation:A.J. Colussi, F. Leung, M.R. Hoffmann , Environ. Chem. 2004, 1, 44.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59163
Deposited By: George Porter
Deposited On:05 Aug 2015 22:21
Last Modified:10 Nov 2021 22:16

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