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Kinetic Studies of Nitrate Radicals: Flash Photolysis at 193 nm

AutorBecerra, R. ; Pfrang, C.
Fecha de publicación2016
EditorJohn Wiley & Sons
CitaciónInternational Journal of Chemical Kinetics 48: 806- 811 (2016)
ResumenNitrate radicals, NO, were produced for the first time by 193 nm laser flash photolysis of NO and HNO. Detection was achieved due to NO's strong absorption at 622.7 nm confirmed by measurements of the absorption spectrum in the range of 617–625 nm using both NO precursors. Time-resolved kinetic studies allowed the determination of room temperature rate coefficients for the reactions of NO with 2-methylbut-2-ene and NO of (1.28 ± 0.11) × 10 and (8.4 ± 1.2) × 10 cm molecule s, respectively. The rate coefficients compare well to previous measurements with alternative techniques, suggesting that the reported method is valid and may be applied in follow-up studies. The rate coefficient for 2-methylbut-2-ene is compared to previous measurements and predictions for the alkene as well as the related alkenol. The new data are consistent with a previously suggested deactivation of the reactive site of the double bond if adjacent to an OH group. A calculated atmospheric lifetime for 2-methylbut-2-ene with respect to NO-initiated oxidation of less than 3 min suggests predominant removal by NO in the atmosphere.
Identificadoresdoi: 10.1002/kin.21035
issn: 1097-4601
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