Experimental Study of SO2 Formation in the Reactions of CH3SO Radical with NO2 and O3 in Relation with the Atmospheric Oxidation Mechanism of Dimethyl Sulfide
| Autor: | Georges Le Bras, Alexander Kukui, G. Laverdet, Dmitri Borissenko |
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| Přispěvatelé: | Laboratoire de combustion et systèmes reactifs (LCSR), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO) |
| Rok vydání: | 2003 |
| Předmět: |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere 010304 chemical physics Radical Photodissociation Analytical chemistry 010402 general chemistry 7. Clean energy 01 natural sciences Decomposition 0104 chemical sciences [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry chemistry.chemical_compound Reaction rate constant chemistry Torr Yield (chemistry) 0103 physical sciences Dimethyl sulfide Physical and Theoretical Chemistry Laser-induced fluorescence ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Physical Chemistry A Journal of Physical Chemistry A, American Chemical Society, 2003, 107 (8), pp.1155-1161. ⟨10.1021/jp021701g⟩ |
| ISSN: | 1520-5215 1089-5639 |
| Popis: | Reactions of CH3SO radicals with O3 and NO2 have been studied at 140−660 Torr pressure of N2 and 300 K using the pulsed laser photolysis technique with direct monitoring of SO2 formation by laser induced fluorescence with excitation at 220.6 nm. The yield of SO2 in the reaction of CH3SO with NO2 has been found to be pressure dependent varying from (0.4 ± 0.12) at 100 Torr to (0.25 ± 0.05) at 664 Torr of N2. This result is in agreement with our previous data obtained using different experimental approach and may be interpreted by the formation of activated CH3SO2* radical followed by its prompt decomposition or collisional stabilization. The SO2 yield in the reaction of CH3SO with O3 has been found to be a factor (4.0 ± 0.3) higher than in the reaction with NO2 corresponding to a yield of (1.0 ± 0.12) at 660 Torr of N2. The rate constant for the reactions CH3SO + O3, O + CH3SSCH3, and O + CS2 at 300 K have been found to be (3.2 ± 0.9) × 10-13, (1.06 ± 0.07) × 10-10, and (3.6 ± 0.1) × 10-12 cm3 molecule-1 s... |
| Databáze: | OpenAIRE |
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