The fate of the hydroxyalkoxy radical in the OH-initiated oxidation of isoprene
June E. Reitz
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorW. Sean McGivern
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorM. Clark Church
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorMarc D. Wilson
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorCorresponding Author
Simon W. North
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842Search for more papers by this authorJune E. Reitz
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorW. Sean McGivern
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorM. Clark Church
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorMarc D. Wilson
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Search for more papers by this authorCorresponding Author
Simon W. North
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842
Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842Search for more papers by this authorAbstract
Rate constants for several intermediate steps in the OH-initiated oxidation of isoprene were determined using laser-photolysis/laser-induced fluorescence of OH radicals at total pressures between 3 and 4 Torr at 295 K. The rate constant for decomposition of the hydroxyalkoxy radical was determined to be (3.0 ± 0.5) × 104 s−1 in this pressure range, which is in fair agreement with previous work. The presence of a prompt alkoxy decomposition pathway was also investigated and found to contribute less than 10% to the total hydroxyalkoxy radical decomposition. The rate constant for the reaction of the hydroxyperoxy radical with NO was determined to be (2.5 ± 0.5) × 10−11 cm3 molecule−1 s−1, which is moderately higher than previously reported. © 2002 Wiley Periodicals, Inc. Int J Chem Kinet 34: 255–261, 2002
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