Document Detail

HNO3 forming channel of the HO2 + NO reaction as a function of pressure and temperature in the ranges of 72-600 Torr and 223-323 K.
MedLine Citation:
PMID:  17718462     Owner:  NLM     Status:  PubMed-not-MEDLINE    
A high-pressure turbulent flow reactor coupled with a chemical ionization mass-spectrometer was used to determine the branching ratio of the HO(2) + NO reaction: HO(2) + NO --> OH + NO(2) (1a), HO(2) + NO --> HNO(3) (1b). The branching ratio, beta = k(1b)/k(1a), was derived from the measurements of "chemically amplified" concentrations of the NO(2) and HNO(3) products in the presence of O(2) and CO. The pressure and temperature dependence of beta was determined in the pressure range of 72-600 Torr of N(2) carrier gas between 323 and 223 K. At each pressure, the branching ratio was found to increase with the decrease of temperature, the increase becoming less pronounced with the increase of pressure. In the 298-223 K range, the data could be fitted by the expression: beta(T,P) = (530 +/- 10)/T(K) + (6.4 +/- 1.3) x 10(-4)P(Torr) - (1.73 +/- 0.07), giving beta approximately 0.5% near the Earth's surface (298 K, 760 Torr) and 0.8% in the tropopause region (220 K, 200 Torr). The atmospheric implication of these results is briefly discussed.
Nadezhda Butkovskaya; Alexandre Kukui; Georges Le Bras
Publication Detail:
Type:  Journal Article     Date:  2007-08-24
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  111     ISSN:  1089-5639     ISO Abbreviation:  J Phys Chem A     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-09-13     Completed Date:  2007-11-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9047-53     Citation Subset:  -    
CNRS, Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), 1C Av. de la Recherche Scientifique, 45071 Orléans Cedex 2, France.
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