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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25 Citations (Scopus)


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
Issue number5
Publication statusPublished - 1999

Bibliographical note

Funding Information:
We thank H. Liu for handling the mouse colony, A. Tarasenko for technical assistance and R. Axel for invaluable advice. We thank H. Jiang and S. Cremers of the Clinical and Translational Science Award Program at Columbia University Medical Center for measuring whole-blood serotonin content. This publication was supported by the National Center for Advancing Translational Sciences, US National Institutes of Health (NIH), through grant UL1 TR000040. The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIH. This work was supported by NIH grant P01-AG032959.

All Science Journal Classification (ASJC) codes

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


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