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MO: Molekülphysik
MO 8: Posters Thursday: Dissociation and other Collision Processes
MO 8.14: Poster
Thursday, April 5, 2001, 12:30–15:00, AT3
Dissociative Recombination of HCNH+; Cross Sections and Branching Ratios — •J. Semaniak1, B. Minaev2, A.M. Derkatch2, F. Hallberg2, A. Neau2, S. Rosén2, R. Thomas2, M. Larsson2, M. af Ugglass3, and H. Danared3 — 1Institute of Physics, Pedagogical University, ul. Swietokrzyska 15, 25-406 Kielce, Poland — 2Department of Physics, Stockholm University, P.O. Box 6730, S-113 85 Stockholm, Sweden — 3Manne Siegbahn Laboratory, S-104 05 Stockholm, Sweden
Dissociative recombination (DR) of HCNH+ has been studied at the heavy ion storage ring CRYRING, Stockholm. The absolute cross sections have been measured between 3 meV and 0.2 eV collision energy. The DR thermal rate coefficients, which can be directly applied to modeling environments in thermal equilibrium, have been found to be 3.3× 10−7(300/T)0.71 at temperatures T < 1000 K. The DR branching fractions have been measured for different dissociation channels: HCN(HNC)+ H (0.67), CN + H2 (0.0) and CN + H + H (0.33) at collision energy of 0±3 meV. The results show that DR of HCNH+ is an efficient process leading to formation of HCN or HNC isomers and three body fragmentation dominates CN production. The multireference self-consistent calculations (MC SCF) in a complete active space (CAS) have been used as a common background for all studied species and reaction paths. Three body fragmentation CN+H+H have been considered in one concerted elementary reaction step.