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

doi:10.1021/jp983613v

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

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

43 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 = k_1a/(k_1a+k_1b), 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 language	English
Pages (from-to)	1566-1571
Number of pages	6
Journal	Journal of Physical Chemistry A
Volume	103
Issue number	11
DOIs	https://doi.org/10.1021/jp983613v
Publication status	Published - 1999 Mar 18

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry

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10.1021/jp983613v

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

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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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, S.

AU - Hanson, R. K.

AU - Bowman, C. T.

PY - 1999/3/18

Y1 - 1999/3/18

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

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