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. https://resolver.caltech.edu/CaltechAUTHORS:20150803-161142204
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Abstract
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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| 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 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20150803-161142204 | |||||||||
| Official Citation: | A.J. Colussi, F. Leung, M.R. Hoffmann , Environ. Chem. 2004, 1, 44. http://dx.doi.org/10.1071/EN04010 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 59163 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 05 Aug 2015 22:21 | |||||||||
| Last Modified: | 03 Mar 2020 13:01 |
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