A shock tube study of the product branching ratio for the reaction NH2 + NO using frequency-modulation detection of NH2

M. Votsmeier, S. Song, R. K. Hanson, C. T. Bowman

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36 Citations (Scopus)


The product branching ratio of (NH2 + NO → N2H + OH]:[NH2 + NO → N2 + H2O] has been determined in the temperature range of 1340-1670 K in a shock tube study with laser photolytic generation of the NH2 radicals. Sensitive frequency-modulation detection of the NH2 radical enables experiments with very low initial radical concentrations and, hence, virtually no interference from secondary reactions or dependence on the overall rate coefficient of the reaction. The branching ratio, a, defined as α = k1a/(k1a+k1b), increases from 0.42 at 1340 K to 0.53 at 1670 K. Over this temperature range our results can be expressed as α = 0.5 + (3.36 × 10-4)(T/K - 1600). A detailed error analysis yields an uncertainty in the values of a of ±0.02 near 1500 K, increasing to ±0.05 at the temperature extremes.

Original languageEnglish
Pages (from-to)1566-1571
Number of pages6
JournalJournal of Physical Chemistry A
Issue number11
Publication statusPublished - 1999 Mar 18

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry


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