Shock tube studies using a novel multipass absorption Cell: Rate constant results for OH + H 2 and OH + C 2H 6

L. N. Krasnoperov, J. V. Michael

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62 Scopus citations

Abstract

The reflected shock tube technique with a novel multipass absorption spectrometric detection method has been used to study two OH-radical reactions: OH + H 2 → H 2O + H (1), and OH + C 2H 6 → H 2O + C 2H 5 (2). Reaction 1 was chosen in order to test the method against earlier rate constant determinations. The measurements on both reactions were performed in single-shot experiments with low initial concentrations of hydroxyl radicals, [OH] 0 = (5 - 15) × 10 12 molecule cm -3, which allowed reliable isolation of the elementary reactions. The measured rate constants are: k 1 = 5.44 × 10 -11 exp(-3220 K/T) (832-1359 K), and k 2 = 1.10 × 10 -10 exp(-2537 K/T) (822-1367 K), both in cm 3 molecule -1 s -1. The present study extends the experimental T-range for reaction 2. This new work and earlier lower-T studies have been combined to give a new evaluation, k 2 - 2.68 × 10 -18 (T/K) 2.224 exp(-373 K/T) cm 3 molecule -1 s -1. An ab initio potential energy surface was additionally used to derive a theoretical expression for this reaction.

Original languageEnglish (US)
Pages (from-to)5643-5648
Number of pages6
JournalJournal of Physical Chemistry A
Volume108
Issue number26
DOIs
StatePublished - Jul 1 2004

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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