Kinetics and mechanism of the reactions of CH sub 3 S with O sub 2 and NO sub 2 at 298 K
- National Oceanic and Atmospheric Administration, Boulder, CO (USA)
Rate coefficients for the reactions CH{sub 3}S + O{sub 2} {yields} products (1) and CH{sub 3}S + NO{sub 2} {yields} products (2) have been measured at 298 K by laser induced fluorescence detection of CH{sub 3}S which was generated by pulsed 248-nm laser photolysis of CH{sub 3}SSCH{sub 3}, k{sub 1} was found to be less than 2.5 {times} 10{sup {minus}18} cm{sup 3} s{sup {minus}1}. k{sub 2} was measured to be (6.10 {plus minus} 0.90) {times} 10{sup {minus}11} cm{sup 3} s{sup {minus}1}. The mechanism of reactions 1 and 2 was investigated. The major product in reaction 2 is NO, with a yield of 0.80 {plus minus} 0.20. Secondary production of NO was observed, indicating that CH{sub 3}SO formed in reaction 2 also reacts with NO{sub 2}, with a rate coefficient of (8 {plus minus} 5) {times} 10{sup {minus}12} cm{sup 3} s{sup {minus}1}. At long reaction times laser excited fluorescence was detected from a product, possibly CH{sub 3}SO{sub 2}.
- OSTI ID:
- 5110522
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:6; ISSN 0022-3654; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
540110
ALKYL RADICALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
DECOMPOSITION
EXCIMER LASERS
EXPERIMENTAL DATA
FLUORESCENCE
GAS LASERS
INFORMATION
KINETICS
LASERS
LUMINESCENCE
MEDIUM TEMPERATURE
METHYL RADICALS
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RADICALS
REACTION KINETICS
THIYL RADICALS