title: Rotational Mode Specificity in Cl + CH4(v3=1,|jNl⟩): Role of Reactant's Vibrational Angular Momentum.
abstract: The effect of initial rotational states in the reaction of antisymmetric-excited CH4(v3=1,|jNl⟩) with Cl atom was investigated in a crossed-beam, product-imaging experiment over the collisional energy (Ec) range of 2-5 kcal mol(-1). We found that while the initial rotational excitations exert a noticeable effect on total reactivity, they leave little imprint on the more detailed product-state and angular distributions. This finding echoes the previous conclusion in the analogous Cl + CHD3(v1=1,|NK⟩) reaction. However, the rotational enhancement factor is substantial at low Ec and then becomes insignificant at higher Ec, in contrast to the Cl + CHD3 case. A more intriguing finding is the role of the vibrational angular momentum (l) in promoting the reactivity. A heuristic picture is proposed to rationalize the observations.
authors.affiliation: Institute of Atomic and Molecular Sciences (IAMS), Academia Sinica , P.O. Box 23-166, Taipei, Taiwan 10617.
authors.forename: Huilin
authors.initials: H
authors.lastname: Pan
authors.affiliation: Institute of Atomic and Molecular Sciences (IAMS), Academia Sinica , P.O. Box 23-166, Taipei, Taiwan 10617.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Cheng
authors.affiliation: Institute of Atomic and Molecular Sciences (IAMS), Academia Sinica , P.O. Box 23-166, Taipei, Taiwan 10617.
authors.forename: Kopin
authors.initials: K
authors.lastname: Liu