Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 122, Issue 18, Pages 4465-4469Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.8b03524
Keywords
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Funding
- NASA [NNX15AP-ZOG]
- Army Research Office [W911NF1710115]
- Danish Center for Scientific Computing, University of Copenhagen
- Center for Exploitation of Solar Energy
- Augustinus Fonden
- U.S. Department of Defense (DOD) [W911NF1710115] Funding Source: U.S. Department of Defense (DOD)
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The reaction of electronically excited triplet state sulfur dioxide ((SO2)-S-3) with water was investigated both theoretically and experimentally. The quantum chemical calculations find that the reaction leads to the formation of hydroxyl radical (OH) and hydroxysulfinyl radical (HOSO) via a low energy barrier pathway. Experimentally the formation of OH was monitored via its reaction with methane, which itself is relatively unreactive with (SO2)-S-3, making it a suitable probe of OH production from the reaction of (SO2)-S-3 and water. This reaction has implications for the formation of OH in environments that are assumed to be depleted in OH, such as volcanic plumes. This reaction also provides a mechanism for the formation of OH in planetary atmospheres with little or no oxygen (O-2) or ozone (O-3) present.
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