Atmospheric oh rate constant
18 Aug 2018 Their atmospheric concentrations are influenced by chemical reactions in the atmosphere, where the main removal pathway for alkanes and The rate constant for the reaction of CH2ClBr with OH was measured by both flash photolysis resonance fluorescence and discharge flow electron paramagnetic Rate Constants and Atmospheric. Lifetimes for the Reactions of OH. Radicals and C1 Atoms with Haloalkanes. T. DONAGHI'*, I. SHANAHAN, M. HANDE, and S. In this work we have performed a QSAR study of atmospheric reactions with The experimental rate constants (kOH) for the reactions of OH radical with 98 Determination of rate constants for reactions of some hydrohaloalkanes with OH radicals and their atmospheric lifetimes. Authors; Authors and affiliations. The reaction with the OH radical constitutes the singlemost important removal process for most organiccompounds found in the atmosphere. Efforts to
Rate constants for the reactions of OH with CH3Cl, However, for the chloromethanes all the rate constants are lower at atmospheric temperatures than previously reported, especially for CH 2 Cl 2 where the present rate constant is about a factor of 1.6 below the JPL 92‐20 value. The new rate constant appears to resolve a discrepancy
this article, we report the overall rate constant of OH with COL as measured by the relative rate method [12]. The observed products of the OH COL reac-tion in the presence of NO are reported and used to assess COL’s expected atmospheric reaction mecha-nism. Neither the OH rate constant nor possible reac- The rate constant for the reaction of CH 2 ClBr with OH was measured by both flash photolysis resonance fluorescence and discharge flow electron paramagnetic resonance techniques over the temperature range 277-370 K. Rate constants for the reactions of OH with CH3Cl, However, for the chloromethanes all the rate constants are lower at atmospheric temperatures than previously reported, especially for CH 2 Cl 2 where the present rate constant is about a factor of 1.6 below the JPL 92‐20 value. The new rate constant appears to resolve a discrepancy 2 as the OH source. The 298 K rate constant for OH + C 3H 8 was found to be (1.15 ± 0.1) × 10 −12 cm3 s 1, in excellent agreement with the litera-ture recommendation, and with a separate determination us-ing HNO 3 photolysis at 248 nm as the OH source. The 298 K rate constants for OH + n−C 3H 7I and i−C 3H 7I were mea- The OH + SO2 reaction plays a critical role in understanding the oxidation of SO2 in the atmosphere, and its rate constant is critical for clarifying the fate of SO2 in the atmosphere. The rate constant of the OH + SO2 reaction is calculated here by using beyond-CCSDT correlation energy calculations for a be Rate constants for the gas-phase reactions of the OH radical with a series of aromatic hydrocarbons at 296 ± 2 K. the xylenes, and the trimethylbenzenes. Using the recommended literature rate constant for the reaction of OH radicals with propene of (2.66 ± 0.40 The atmospheric oxidation mechanism of 1,2,4-trimethylbenzene If the rate constants (k tot) for a number of simple alkanes are known, the experimental data can be fit to obtain best values for k p, k s, and k 1. These can then be used to predict the rate constant for the reaction of OH with an alkane where experimental measurements have not been made.
EXECUTIVE SUMMARY RATE CONSTANTS The chemistry of HCFC's and HFC's in the troposphere is controlled by reactions with OH in which a hydrogen atom is abstracted from the halocarbon to form water and a halo-alkyl radical.
laboratory OH reaction rate constant data over the temperature range of atmospheric interest. Both data scattering and systematic uncertainty associated with instrumental measurements contribute to the total uncertainty of the rate constant. Although data scattering does not In this work, we have investigated the gas phase reaction of OH with several alkanes and aromatic compounds at 288 K (sea level temperature) and 248 K (in the free troposphere this temperature corresponds to a height of approximately 5–8 km, depending on latitude and season []).Using n-pentane [] and toluene [] as reference compounds, the rate constants for the reactions of OH radicals with
Rate Constants and Atmospheric. Lifetimes for the Reactions of OH. Radicals and C1 Atoms with Haloalkanes. T. DONAGHI'*, I. SHANAHAN, M. HANDE, and S.
The reaction rate constants of ozone with 95 alkenes (-logkO3) and the hydroxyl radical (•OH) with 98 alkenes (-logkOH) in the atmosphere were predicted by 27 Feb 2018 in atmospheric particles, using an aerosol flow tube reactor at a high relative humidity that the heterogeneous OH reaction rate constant, k, is. 16 Jan 2019 Reaction rate constants with OH radicals at 253–328 K and atmospheric implications for (CF3)2CHOCxH(2x + 1) (x = 1, 2, 3). Author links open 29 May 2019 The reactions of OH with toluene are important elementary steps in of H from methyl should not be neglected in atmospheric chemistry, OH adduct as well as the forward and backward rate constants for its formation [14].
Search all gas-phase reactions, by species name, formula, Inchi and smiles This website provides kinetic and photochemical data evaluated by the IUPAC Task Group on Atmospheric Chemical Kinetic Data Evaluation.
The rate constant for the reaction of CH2ClBr with OH was measured by both flash photolysis resonance fluorescence and discharge flow electron paramagnetic Rate Constants and Atmospheric. Lifetimes for the Reactions of OH. Radicals and C1 Atoms with Haloalkanes. T. DONAGHI'*, I. SHANAHAN, M. HANDE, and S. In this work we have performed a QSAR study of atmospheric reactions with The experimental rate constants (kOH) for the reactions of OH radical with 98 Determination of rate constants for reactions of some hydrohaloalkanes with OH radicals and their atmospheric lifetimes. Authors; Authors and affiliations. The reaction with the OH radical constitutes the singlemost important removal process for most organiccompounds found in the atmosphere. Efforts to measured the rate constant of eugenol with OH radicals. They found that the SOA formation yield was 0.11–0.31 at different eugenol concentrations and would Using a relative rate method, rate constants for the gas-phase reactions of OH of alkylnaphthalenes have been measured at 298 +/- 2 K and at atmospheric
12 Dec 2017 via oxidation of 2-hexanol by OH (Scheme 2) in a ∼1-m3 environmental chamber made of Teflon. To determine the rate constants of the H-shifts, Compilation of recommended rate constants for reactions of volatile organic compounds with OH radicals, ozone, NO 3 radicals and Cl atoms under atmospheric