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

Document Type

Article

Publication Date

7-1-2004

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.

Identifier

3142683870 (Scopus)

Publication Title

Journal of Physical Chemistry A

External Full Text Location

https://doi.org/10.1021/jp040186e

ISSN

10895639

First Page

5643

Last Page

5648

Issue

26

Volume

108

This document is currently not available here.

Share

COinS