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

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

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

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
Volume103
Issue number11
Publication statusPublished - 1999 Dec 1

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Shock tubes
shock tubes
Frequency modulation
frequency modulation
products
error analysis
Temperature
Error analysis
temperature
interference
Lasers
coefficients
lasers
Experiments

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

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abstract = "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.",
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A shock tube study of the product branching ratio for the reaction NH2 + NO using frequency-modulation detection of NH2. / Votsmeier, M.; Song, Soonho; Hanson, R. K.; Bowman, C. T.

In: Journal of Physical Chemistry A, Vol. 103, No. 11, 01.12.1999, p. 1566-1571.

Research output: Contribution to journalArticle

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T1 - A shock tube study of the product branching ratio for the reaction NH2 + NO using frequency-modulation detection of NH2

AU - Votsmeier, M.

AU - Song, Soonho

AU - Hanson, R. K.

AU - Bowman, C. T.

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N2 - 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.

AB - 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.

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