Kinetics of the reactions of CH2Br and CH2I radicals with molecular oxygen at atmospheric temperatures

Physical Chemistry Chemical Physics : PCCP
Arkke J EskolaRaimo S Timonen

Abstract

The kinetics of the reactions of CH2Br and CH2I radicals with O2 have been studied in direct measurements using a tubular flow reactor coupled to a photoionization mass spectrometer. The radicals have been homogeneously generated by pulsed laser photolysis of appropriate precursors at 193 or 248 nm. Decays of radical concentrations have been monitored in time-resolved measurements to obtain the reaction rate coefficients under pseudo-first-order conditions with the amount of O2 being in large excess over radical concentrations. No buffer gas density dependence was observed for the CH2I + O2 reaction in the range 0.2-15 x 10(17) cm(-3) of He at 298 K. In this same density range the CH2Br + O2 reaction was obtained to be in the third-body and fall-off area. Measured bimolecular rate coefficient of the CH2I + O2 reaction is found to depend on temperature as k(CH2I + O2)=(1.39 +/- 0.01)x 10(-12)(T/300 K)(-1.55 +/- 0.06) cm3 s(-1)(220-450 K). Obtained primary products of this reaction are I atom and IO radical and the yield of I-atom is significant. The rate coefficient and temperature dependence of the CH2Br + O2 reaction in the third-body region is k(CH2Br + O2+ He)=(1.2 +/- 0.2)x 10(-30)(T/300 K)(-4.8 +/- 0.3) cm6 s(-1)(241-363 K...Continue Reading

References

Mar 2, 1999·Nature·F SpoorD E Lieberman
Jun 7, 2002·Nature·Colin D O'DowdThorsten Hoffmann

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Citations

Oct 29, 2011·Chemical Reviews·Alfonso Saiz-LopezRussell W Saunders
Nov 5, 2014·The Journal of Chemical Physics·Yu-Hsuan Huang, Yuan-Pern Lee
Jun 8, 2015·The Journal of Chemical Physics·Hongwei LiMarsha I Lester
Aug 13, 2015·The Journal of Physical Chemistry. a·Elizabeth S Foreman, Craig Murray
Jul 17, 2015·The Journal of Chemical Physics·Yuan-Pern Lee
Aug 19, 2015·The Journal of Physical Chemistry Letters·Zachary J BurasWilliam H Green
Nov 26, 2015·Physical Chemistry Chemical Physics : PCCP·Elizabeth S ForemanCraig Murray
Apr 5, 2016·Physical Chemistry Chemical Physics : PCCP·Jaroslaw KalinowskiR Benny Gerber
Nov 22, 2017·Physical Chemistry Chemical Physics : PCCP·Kara M KapnasCraig Murray
Aug 24, 2018·Physical Chemistry Chemical Physics : PCCP·Balaganesh MuthiahKing-Chuen Lin
Dec 3, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Tom J GravestockDwayne E Heard
Jun 11, 2019·Physical Chemistry Chemical Physics : PCCP·David V ChicharroJean-Christophe Loison
May 20, 2011·Physical Chemistry Chemical Physics : PCCP·Shaoliang ZhangCornelius Zetzsch
Nov 12, 2013·The Journal of Chemical Physics·Shih-Huang LeeWen-Jian Huang
Nov 30, 2013·Physical Chemistry Chemical Physics : PCCP·Daniel StonePaul Seakins
Oct 12, 2013·Physical Chemistry Chemical Physics : PCCP·Daniel StonePaul Seakins
Oct 8, 2013·Physical Chemistry Chemical Physics : PCCP·Craig A TaatjesCarl J Percival
Jul 10, 2017·The Journal of Chemical Physics·Michael F VanscoMarsha I Lester
Apr 26, 2014·Physical Chemistry Chemical Physics : PCCP·Wei-Lun TingJim Jr-Min Lin
Apr 7, 2012·Physical Chemistry Chemical Physics : PCCP·Craig A TaatjesCarl J Percival
Aug 19, 2020·Physical Chemistry Chemical Physics : PCCP·Ting-Yu Chen, Yuan-Pern Lee
Jan 6, 2010·The Journal of Physical Chemistry. a·Stéphane BailleuxHiroyuki Ozeki
Feb 6, 2010·The Journal of Physical Chemistry. a·Matti P RissanenRaimo S Timonen
Apr 17, 2012·The Journal of Physical Chemistry. a·Matti P RissanenRaimo S Timonen
Dec 19, 2013·The Journal of Physical Chemistry Letters·Leonid Sheps
Feb 25, 2014·The Journal of Physical Chemistry. a·Zachary J BurasWilliam H Green
Apr 7, 2015·Chemical Reviews·Luc VereeckenMichael J Pilling
Apr 29, 2015·The Journal of Physical Chemistry. a·Zachary J BurasWilliam H Green
Jan 12, 2013·The Journal of Physical Chemistry. a·Matti P RissanenRaimo S Timonen
Dec 30, 2017·The Journal of Physical Chemistry. a·Sara V TadayonCraig Murray

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