ACTIVATION BARRIERS FOR SERIES OF EXOTHERMIC HOMOLOGOUS REACTIONS .4. COMPARISON OF MEASUREMENTS TO THEORY FOR REACTIONS OF S(2)P(1) ATOMS WITH N2O

The kinetics of the Al+N2O→AlO+N2 reaction has been studied in a high-temperature fast-flow reactor (HTFFR). The expression k(520-1030 K)=4.6X10-12 (T/K)0.5 exp(-778 K/T) cm 3 molecule-1 s-1 has been derived from a nonlinear regression analysis of the measured rate coefficients. 2σ precision limits are about ±5% and accuracy limits are estimated to be about ±23%. Combining the data with a 296 K literature measurement yields k(296-1030 K) = 5.8X10-15 (T/K)1.37 exp(-90.4 K/T) cm3 molecule-1 s-1, with 2σ estimated accuracy limits of about ±27%. The semiempirical approach used previously to predict activation barriers for s1 and s2 metal atom reactions with N2O has been modified to allow predictions of group 13 atom reactions with N2O. The activation barriers for the B, Ga, In, and Tl atom reactions are calculated from the experimental activation barrier of the Al+N2O reaction. © 1995 American Institute of Physics.