Rate coefficient expressions for reactions of molecules in 2Π electronic states at low temperatures

Abstract

Analytical rate coefficient expressions are derived at low temperatures for the fast reactions of a 2Π molecule with each of a structureless ion, a 2Π molecule, and a 1Σ molecule. The procedure, based on classical capture theory, involves perturbation theory and simple long-range electrostatic potential terms for the various interactions. The open-shell nature of the reactant molecules is fully considered. The predictions made are contrasted with those quoted previously for the equivalent reactions involving 1Σ molecules and interesting differences in the temperature dependencies of the rate coefficient are highlighted.