Journal ArticleDOI
Experimental and Estimated Rate Constants for the Reactions of Hydroxyl Radicals with Several Halocarbons
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TLDR
In this article, rate constants for additional compounds of these types are estimated using an empirical rate constant estimation method which is based on measured rate constants of halocarbons for a wide range of halomethanes and 25 haloethanes.Abstract:
Relative rate experiments are used to measure rate constants and temperature dependencies of the reactions of OH with CH3F (41), CH2FCl (31), CH2BrCl (30B1), CH2Br2 (3OB2), CHBr3 (2OB3), CF2BrCHFCl (123aBl(alpha)), and CF2ClCHCl2 (122). Rate constants for additional compounds of these types are estimated using an empirical rate constant estimation method which is based on measured rate constants for a wide range of halocarbons. The experimental data are combined with the estimated and previously reported rate constants to illustrate the effects of F, Cl, and Br substitution on OH rate constants for a series of 19 halomethanes and 25 haloethanes. Application of the estimation technique is further illustrated for some higher hydrofluorocarbons (HFCs), including CHF2CF2CF2CF2H (338pcc), CF3CHFCHFCF2CF3 (43-10mee), CF3CH2CH2CF3 (356ffa), CF3CH2CF2CH2CF3 (458mfcf), CF3CH2CHF2 (245fa), and CF3CH2CF2CH3 (365mfc). The predictions are compared with literature data for these compounds.read more
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Thermal hydrogen-atom transfer from methane: the role of radicals and spin states in oxo-cluster chemistry.
TL;DR: The focus of this Minireview concerns the role that the intrinsic properties of gaseous oxo-clusters play to permit HAT reactivity from saturated hydrocarbons at ambient conditions.
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Selective alkane transformations via radicals and radical cations: insights into the activation step from experiment and theory.
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Analysis of Present Day and Future OH and Methane Lifetime in the ACCMIP Simulations
Apostolos Voulgarakis,Apostolos Voulgarakis,Vaishali Naik,Jean-Francois Lamarque,Drew Shindell,Paul Young,Paul Young,Paul Young,Michael J. Prather,Oliver Wild,Robert D. Field,Robert D. Field,Dan Bergmann,Philip Cameron-Smith,Irene Cionni,William J. Collins,William J. Collins,S. B. Dalsøren,Ruth M. Doherty,Veronika Eyring,Gregory Faluvegi,Gerd A. Folberth,Larry W. Horowitz,Béatrice Josse,Ian A. MacKenzie,Tatsuya Nagashima,David A. Plummer,Mattia Righi,S. T. Rumbold,David Stevenson,Sarah A. Strode,Kengo Sudo,Sophie Szopa,Guang Zeng +33 more
TL;DR: In this paper, results from simulations performed for the At- mospheric Chemistry and Climate Modeling Intercompari- son Project (ACCMIP) are analysed to examine how OH and methane lifetime may change from present day to the future, under different climate and emissions scenarios.
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Gas-phase and heterogeneous chemical kinetics of the troposphere and stratosphere
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