Articles | Volume 24, issue 2
https://doi.org/10.5194/acp-24-1299-2024
https://doi.org/10.5194/acp-24-1299-2024
Research article
 | 
30 Jan 2024
Research article |  | 30 Jan 2024

Chamber studies of OH + dimethyl sulfoxide and dimethyl disulfide: insights into the dimethyl sulfide oxidation mechanism

Matthew B. Goss and Jesse H. Kroll

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Cited articles

Arsene, C., Barnes, I., Becker, K. H., Schneider, W. F., Wallington, T. T., Mihalopoulos, N., and Patroescu-Klotz, I. V.: Formation of Methane Sulfinic Acid in the Gas-Phase OH-Radical Initiated Oxidation of Dimethyl Sulfoxide, Environ. Sci. Technol., 36, 5155–5163, https://doi.org/10.1021/es020035u, 2002. 
Assaf, E., Finewax, Z., Marshall, P., Veres, P. R., Neuman, J. A., and Burkholder, J. B.: Measurement of the Intramolecular Hydrogen-Shift Rate Coefficient for the CH3SCH2OO Radical between 314 and 433 K, J. Phys. Chem. A, 127, 2336–2350, https://doi.org/10.1021/acs.jpca.2c09095, 2023. 
Bandy, A. R., Scott, D. L., Blomquist, B. W., Chen, S. M., and Thornton, D. C.: Low yields of SO2 from dimethyl sulfide oxidation in the marine boundary layer, Geophys. Res. Lett., 19, 1125–1127, https://doi.org/10.1029/92GL01041, 1992. 
Bandy, A. R., Thornton, D. C., Blomquist, B. W., Chen, S., Wade, T. P., Ianni, J. C., Mitchell, G. M., and Nadler, W.: Chemistry of dimethyl sulfide in the equatorial Pacific atmosphere, Geophys. Res. Lett., 23, 741–744, https://doi.org/10.1029/96GL00779, 1996. 
Barnes, I., Bastian, V., Becker, K. H., and Martin, D.: Fourier Transform IR Studies of the Reactions of Dimethyl Sulfoxide with OH, NO3, and Cl Radicals, in: Biogenic Sulfur in the Environment, vol. 393, edited by: Saltzman, E. S. and Cooper, W. J., American Chemical Society, Washington, DC, 476–488, https://doi.org/10.1021/bk-1989-0393, 1989. 
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Short summary
The chemistry driving dimethyl sulfide (DMS) oxidation and subsequent sulfate particle formation in the atmosphere is poorly constrained. We oxidized two related compounds (dimethyl sulfoxide and dimethyl disulfide) in the laboratory under varied NOx conditions and measured the gas- and particle-phase products. These results demonstrate that both the OH addition and OH abstraction pathways for DMS oxidation contribute to particle formation via mechanisms that do not involve the SO2 intermediate.
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