Computational Study of the Reactions of Methane with XO Radicals (X = F, Cl, or Br): Implications in Combustion Chemistry

Published

May 1, 2001

Author(s)

F Louis, Thomas C. Allison, Carlos A. Gonzalez, J P. Sawerysyn

Abstract

Theoretical calculations were carried out on the H-atom abstraction reaction from methane by XO (X = F, Cl or Br) radicals attack. Geometry optimizations and vibrational frequency calculations were performed using three methods: Moller-Plesset second-order perturbation theory (MP2), quadratic configuration interaction in the space of single and double excitations (QCISD), and the hybrid three-parameter exchange functional with Becke's non local exchange and Lee-Yang-Parr correlation functional (B3LYP). Single-point energy calculations were performed using several high quality basis sets. Canonical transition-state theory was used to perdict the rate constants as a function of temperature (700 - 2500K), and three-parameter Arrhenius expressions were obtained by fitting to the computed rate constants. The possible impact of the title reactions in combustion chemistry is also discussed.

Citation

Journal of Physical Chemistry A

Volume

105

Issue

No. 17

Pub Type

Journals

Keywords

ab Initio, Arrhenius, Kinetics, rate constant

Citation

Louis, F. , Allison, T. , Gonzalez, C. and Sawerysyn, J. (2001), Computational Study of the Reactions of Methane with XO Radicals (X = F, Cl, or Br): Implications in Combustion Chemistry, Journal of Physical Chemistry A (Accessed October 7, 2025)