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10.
Phys Chem Chem Phys ; 10(11): 1540-54, 2008 Mar 21.
Artigo em Inglês | MEDLINE | ID: mdl-18327310

RESUMO

The technique of pulsed laser photolysis coupled to LIF detection of IO was used to study IO + NO(3) --> OIO + NO(2); I + NO(3) --> (products); CH(2)I + O(2) --> (products); and O((3)P) + CH(2)I(2) --> IO + CH(2)I, at ambient temperature. was observed for the first time in the laboratory and a rate coefficient of k(1 a) = (9 +/- 4) x 10(-12) cm(3) molecule(-1) s(-1) obtained. For , a value of k(2) (298 K) = (1.0 +/- 0.3) x 10(-10) cm(3) molecule(-1) s(-1) was obtained, and a IO product yield close to unity determined. IO was also formed in a close-to-unity yield in , whereas in an upper limit of alpha(3)(IO) < 0.12 was derived. The implications of these results for the nighttime chemistry of the atmosphere were discussed. Box model calculations showed that efficient OIO formation in was necessary to explain field observations of large OIO/IO ratios.


Assuntos
Atmosfera/química , Escuridão , Hidrocarbonetos Iodados/química , Compostos de Iodo/química , Óxido Nítrico/química , Dióxido de Nitrogênio/química , Oxigênio/química , Algoritmos , Cinética , Modelos Químicos , Oceanos e Mares , Fotólise
11.
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