M. Votsmeier et al., Shock tube study of monomethylamine thermal decomposition and NH2 high temperature absorption coefficient, INT J CH K, 31(5), 1999, pp. 323-330
CH3NH2 thermal decomposition is shown to provide a suitable NH2 radical sou
rce 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 1600-2000K t
he low-pressure absorption coefficient is described by the polynominal equa
tion:
k(NH2) = 3.953 10(10)/T-3 + 7.295 X 10(5)/T-2 - 1.549 X 10(3)/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:
k(1) = 2.51 x 10(16) exp(-28430/T) [cm(3) mol(-1) s(-1)]
The uncertainty of the determined rate coefficients is estimated to be +/-2
0%. (C) 1999 John Wiley & Sons. Inc.