title: Existence of an exceptional reaction pathway for H3(+) formation observed in collision-induced dissociation of methane ions at 1000 eV.
abstract: Dissociation of CH(4)(+) ions at 1000 eV induced by collision with Ar atoms was investigated by measuring the kinetic energies of the ionized fragments. At small scattering angles, including zero, H(+), H(2)(+), H(3)(+), CH(3)(+), CH(2)(+), CH(+), and C(+) fragments were observed. The attractive part of the potential in the CH(4)(+)-Ar collision system played an important role in the formation of the ionized fragments. Rainbow scattering, leading to a large scattering cross section, was shown to be responsible for the increased formation of H(3)(+). It is proposed that on collision-induced dissociation of CH(4)(+), its three hydrogen atoms, which form a triangle, simultaneously react and move together to form H(3)(+).
authors.affiliation: Graduate School of Engineering, Kyushu Kyoritsu University, Kitakyushu, Fukuoka 807-8585, Japan. shoji@kyukyo-u.ac.jp
authors.forename: Fumiya
authors.initials: F
authors.lastname: Shoji
authors.forename: Tatsuzo
authors.initials: T
authors.lastname: Nagai
authors.forename: Fumio
authors.initials: F
authors.lastname: Morimoto
mesh_terms: D004583:Electrons; D006859:Hydrogen / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D008697:Methane / Q000737:chemistry*
chemical_list: D007477:Ions; D006859:Hydrogen; D008697:Methane