Chemistry of large hydrated anion clusters X sup minus (H sub 2 O) sub n , n = 0 minus 59 and X = OH, O, O sub 2 , and O sub 3. 3. Reaction of SO sub 2
- Pennsylvania State Univ., University Park (United States)
Sulfur dioxide is a very important species in the atmosphere, and it is also well established that it is one of the key trace neutral reactants involved in the negative ion chemistry of the stratosphere. The kinetics and mechanisms of reactions of large hydrated anion clusters X{sup {minus}}(H{sub 2}O){sub n=0{minus}59}, X = O, OH, O{sub 2}, and O{sub 3}, with SO{sub 2} are studied in a fast flow reactor under well-defined temperatures and pressures. All the clusters, except OH{sup {minus}}, react with SO{sub 2} at near the collision limit; the reactions of the hydrated anions are found to proceed mainly via a ligand switching mechanism where a few water ligands are replaced by one SO{sub 2} molecule which leads to the formation of stable reaction products. At low temperatures and large cluster sizes, association eventually dominates the reaction mechanism. Interestingly, slow rate constants (k < 10{sup {minus}13} cm{sup 3}/s) are found for the reactions between protonated water clusters, H{sup +}(H{sub 2}O){sub n = 1{minus}60} and SO{sub 2}, which show that different signs of charge on the hydrated clusters lead to different reaction mechanisms, and hence alter the reaction kinetics. The possible application of the present results to atmospheric ion chemistry and aqueous solution chemistry are also briefly discussed.
- OSTI ID:
- 7264191
- Journal Information:
- Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:16; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ANIONS
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTION KINETICS
CHEMISTRY
DATA
DISPERSIONS
EXPERIMENTAL DATA
HYDRATES
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
IONS
KINETICS
MIXTURES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
OZONE
REACTION KINETICS
SOLUTIONS
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE EFFECTS