A shock tube study of the product branching ratio for the reaction NH{sub 2} + NO using frequency-modulation detection of NH{sub 2}
Journal Article
·
· Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory
- Stanford Univ., CA (United States)
The product branching ratio of [NH{sub 2} + NO {yields} N{sub 2}H + OH]:[NH{sub 2} + NO {yields} N{sub 2} + H{sub 2}O] has been determined in the temperature range of 1,340--1,670 K in a shock tube study with laser photolytic generation of the NH{sub 2} radicals. Sensitive frequency-modulation detection of the NH{sub 2} 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, {alpha}, defined as {alpha} = k{sub 1a}/(k{sub 1a} + k{sub 1b}), increases from 0.42 at 1,340 K to 0.53 at 1,670 K. Over this temperature range the results can be expressed as {alpha} = 0.5 + (3.36 {times} 10{sup {minus}4})(T/K {minus} 1,600). A detailed error analysis yields an uncertainty in the values of {alpha} of {+-} 0.02 near 1,500 K, increasing to {+-} 0.05 at the temperature extremes.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Deutsche Forschungsgemeinschaft, Bonn (Germany)
- OSTI ID:
- 338478
- Journal Information:
- Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Journal Name: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory Journal Issue: 11 Vol. 103; ISSN 1089-5639; ISSN JPCAFH
- Country of Publication:
- United States
- Language:
- English
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