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Atmospheric chemistry and physics direct detection of oh formation in the reactions of ho2 with ch3c(o)o2 and other substituted peroxy radicals (2008).
| Content Provider | CiteSeerX |
|---|---|
| Author | Dillon, T. J. Crowley, J. N. |
| Abstract | Abstract. This work details the first direct observation of OH as a product from (R1): HO2+CH3C(O)O2→(products), which has generally been considered an atmospheric radi-cal termination process. The technique of pulsed laser pho-tolysis radical generation, coupled to calibrated laser in-duced fluorescence detection was used to measure an OH product yield for (R1) of α1(298 K)=(0.5±0.2). This study of (R1) included the measurement of a rate coefficient k1(298 K)=(1.4±0.5)×10−11 cm3 molecule−1 s−1, substan-tially reducing the uncertainties in modelling this impor-tant atmospheric reaction. OH was also detected as a prod-uct from the reactions of HO2 with three other carbonyl-containing peroxy radicals, albeit at smaller yield, e.g. (R2): HO2+CH3C(O)CH2O2→(products), α2≈0.15. By contrast, OH was not observed (α<0.06) as a major product from reactions where carbonyl functionality was absent, e.g. HO2+HOCH2CH2O2 (R8), and HO2+CH3CH(OH)CH2O2 (R9). |
| File Format | |
| Publisher Date | 2008-01-01 |
| Access Restriction | Open |
| Subject Keyword | Peroxy Radical Oh Formation Atmospheric Chemistry Physic Direct Detection Pulsed Laser Pho-tolysis Radical Generation Rate Coefficient K1 Major Product Work Detail Ho2 Hoch2ch2o2 Impor-tant Atmospheric Reaction First Direct Observation Carbonyl Functionality Ho2 Ch3ch Atmospheric Radi-cal Termination Process Cm3 Molecule In-duced Fluorescence Detection Oh Product Yield |
| Content Type | Text |
| Resource Type | Article |
