Shock tube study of monomethylamine thermal decomposition and NH2 high temperature absorption coefficient

M. Votsmeier, S. Song, D. F. Davidson, R. K. Hanson

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Abstract

CH3NH2 thermal decomposition is shown to provide a suitable NH2 radical source for spectroscopic and kinetic shock tube studies. Using this precursor, the absorption coefficient of the NH2 radical at a detection wavelength of 16739.90 cm-1 has been determined. In the temperature range 1600-2000 K the low-pressure absorption coefficient is described by the polynominal equation: kNH2 = 3.953×1010/ T3+7.295×105/T2-1.549×103/T[atm-1 cm-1]. The uncertainty of the determined absorption coefficient is estimated to be ±10%. The rate of the thermal decomposition reaction CH3NH2+M→CH3+NH2+M is determined over the temperature range 1550-1900 K and at pressures near 1.6 atm. The rate coefficient was found to be: k1 = 2.51×1016 exp(-28430/T) [cm3 mol-1 s-1]. The uncertainty of the determined rate coefficients is estimated to be ±20%.

Original languageEnglish
Pages (from-to)323-330
Number of pages8
JournalInternational Journal of Chemical Kinetics
Volume31
Issue number5
DOIs
Publication statusPublished - 1999 Jan 1

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All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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