Reactions of C2H5 Radicals with O, O3, and NO3: Decomposition Pathways of the Intermediate C2H5O Radical

K. Hoyermann, M. Olzmann, J. Seeba, B. Viskolcz

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The reactions of C2H5 with O, O3, and NO3 have been investigated in a discharge flow reactor at room temperature and pressures between 1 and 3 mbar. The reaction products were detected by mass spectrometry with electron-impact ionization. The product pattern observed is explained in terms of the decomposition of an intermediately formed, chemically activated ethoxy radical. It is shown that, with this assumption, the experimentally determined branching ratios of the different product channels can be reproduced nearly quantitatively by RRKM calculations based on ab initio results for the stationary points of the potential energy surface of C2H5O. For C + O and C2H5 + O3, the existence of an additional, parallel channel leading to OH has to be assumed. High-pressure Arrhenius parameters for the unimolecular reactions of the ethoxy radical are given and discussed.

Original languageEnglish
Pages (from-to)5692-5698
Number of pages7
JournalJournal of Physical Chemistry A
Issue number29
Publication statusPublished - Jul 22 1999

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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