Shock Tube Studies Using a Novel Multipass Absorption Cell: Rate Constant Results For OH + H2and OH + C2H6
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Abstract
The reflected shock tube technique with a novel multipass absorption spectrometric detection method has been used to study two OH-radical reactions: OH + H2 → H2O + H (1), and OH + C2H6 → H2O + C2H5 (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) × 1012 molecule cm-3, which allowed reliable isolation of the elementary reactions. The measured rate constants are: k1 = 5.44 × 10-11 exp(−3220 K/T) (832−1359 K), and k2 = 1.10 × 10-10 exp(−2537 K/T) (822−1367 K), both in cm3 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, k2 = 2.68 × 10-18 (T/K)2.224 exp(−373 K/T) cm3 molecule-1 s-1. An ab initio potential energy surface was additionally used to derive a theoretical expression for this reaction.
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