Laser magnetic resonance, resonance fluorescence, and resonance absorption studies of the reaction kinetics of O + OH → H + O2, O + HO2 → OH + O2, N + OH → H + NO, and N + HO2 → products at 300 K between 1 and 5 torr

Wm H. Brune, James J. Schwab, J. G. Anderson

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Abstract

A new tandem axis, laser magnetic resonance-resonance fluorescence-resonance absorption, fast flow system is used to examine the kinetics of four reactions in the oxygen-nitrogen-hydrogen free radical system. The experimental approach emphasizes simultaneous detection of reactants and products, cross calibration of detection axes, multiple sources for free-radical-formation steps, and computer simulation of the time dependence of reactants and products through the course of each reaction. Rate constants are reported as follows: OH + O → H + O2, (3.1 ± 0.5) × 10-11 cm3 molecule-1 s-1; HO2 + O → OH + O2, (5.2 ± 0.8) × 10-11 cm3 molecule-1 s-1; OH + N → H + NO, (4.2 ± 0.8) × 10-11 cm3 molecule-1 s-1; HO2 + N → products, (2.2 ± 0.5) × 10-11 cm3 molecule-1 s-1. Cited uncertainties are 95% confidence limits and include consideration of possible systematic errors. All experiments were done in helium or argon at 300 K and pressures between 1 and 5 torr.

Original languageEnglish (US)
Pages (from-to)4503-4514
Number of pages12
JournalJournal of physical chemistry
Volume87
Issue number22
DOIs
StatePublished - 1983

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

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