Dynamics of chemical and charge transfer reactions of molecular dications: beam scattering and total cross section data on CF 2D + (CF 2H +), CF 2+, and CF + formations in CF 22+ + D 2(H 2) collisions

Abstract

Dynamics of formation of the chemical rearrangement product CF 2D +, the charge transfer product CF 2 +, and the dissociative products CF + and CFD + in collisions of the molecular dication CF 2 ++ with D 2 was investigated in crossed beam scattering experiments over the collision energy range 0.3–1.0 eV (center of mass). The scattering data show that coulomb repulsion between two singly charged products, CF 2 + + D + and CF 2 + + D 2 +, plays a dominant role in the nondissociative processes. A large fraction of the energy available (about 6 eV in the chemical reaction, about 4 eV in the charge transfer) goes into relative translational energy of the products. Relative total cross sections for formation of the nondissociative and dissociative products in collision of CF 2 ++ with D 2 and H 2 were determined over the collision energy range of 0.2–3.6 eV. The shape of the relative velocity dependence of the cross section for CF 2 + formation can be described by a simple model based on the Landau-Zener formalism. The data suggest that the dissociative product CF + is formed prevailingly in a subsequent dissociation of the charge transfer product CF 2 +. A potential surface model is described which accounts for competition of various processes in dication–neutral collisions.