title: Dynamics of the O(3P) + CHD3(vCH = 0,1) reactions on an accurate ab initio potential energy surface.
abstract: Recent experimental and theoretical studies on the dynamics of the reactions of methane with F and Cl atoms have modified our understanding of mode-selective chemical reactivity. The O + methane reaction is also an important candidate to extend our knowledge on the rules of reactivity. Here, we report a unique full-dimensional ab initio potential energy surface for the O((3)P) + methane reaction, which opens the door for accurate dynamics calculations using this surface. Quasiclassical trajectory calculations of the angular and vibrational distributions for the ground state and CH stretching excited O + CHD(3)(v(1) = 0,1) → OH + CD(3) reactions are in excellent agreement with the experiment. Our theory confirms what was proposed experimentally: The mechanistic origin of the vibrational enhancement is that the CH-stretching excitation enlarges the reactive cone of acceptance.
authors.affiliation: Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, GA 30322, USA. czako@chem.elte.hu
authors.forename: Gábor
authors.initials: G
authors.lastname: Czakó
authors.forename: Joel M
authors.initials: JM
authors.lastname: Bowman
mesh_terms: D002713:Chlorine / Q000737:chemistry; D005461:Fluorine / Q000737:chemistry; D008697:Methane / Q000737:chemistry*; D008956:Models, Chemical; D010100:Oxygen / Q000737:chemistry*; D013816:Thermodynamics; D014732:Vibration
chemical_list: D005461:Fluorine; D002713:Chlorine; D008697:Methane; D010100:Oxygen