title: Dissociative recombination of the deuterated acetaldehyde ion, CD3CDO(+): product branching fractions, absolute cross sections and thermal rate coefficient.
abstract: Dissociative recombination of the deuterated acetaldehyde ion CD3CDO(+) has been studied at the heavy-ion storage ring CRYRING, located at the Manne Siegbahn Laboratory, Stockholm, Sweden. Product branching fractions together with absolute DR cross-sections were measured. The branching fractions were determined at a relative collision energy between the ions and the electrons of approximately 0 eV. With a probability of 34% the DR events resulted in no ruptures of bonds between heavy atoms (i.e. no breakage of the C-C bond or the C[double bond, length as m-dash]O bond). In the remaining 66% of the events one of the bonds between the heavy atoms was broken. The energy-dependent cross-section for the DR reaction was measured between approximately 0 and 1 eV relative kinetic energy. In the energy region between 1 meV and 0.2 eV the absolute cross section could be fitted by the expression sigma(E) = 6.8 x 10(-16)E(-1.28) cm(2), whereas in the energy interval between 0.2 and 1 eV the data were best fitted by sigma(E) = 4.1 x 10(-16)E(-1.60) cm(2). From these cross section data the thermal rate coefficient (as a function of the electron temperature), alpha(T) = 9.2 x 10(-7) (T/300)(-0.72) cm(3) s(-1) was obtained.
authors.affiliation: Department of Physics, AlbaNova, Stockholm University, SE-106 91, Stockholm, Sweden. wgeppert@hotmail.com
authors.forename: Erik
authors.initials: E
authors.lastname: Vigren
authors.forename: Magdalena
authors.initials: M
authors.lastname: Kamińska
authors.forename: Mathias
authors.initials: M
authors.lastname: Hamberg
authors.forename: Vitali
authors.initials: V
authors.lastname: Zhaunerchyk
authors.forename: Richard D
authors.initials: RD
authors.lastname: Thomas
authors.forename: Jacek
authors.initials: J
authors.lastname: Semaniak
authors.forename: Mathias
authors.initials: M
authors.lastname: Danielsson
authors.forename: Mats
authors.initials: M
authors.lastname: Larsson
authors.forename: Wolf D
authors.initials: WD
authors.lastname: Geppert
mesh_terms: D000079:Acetaldehyde / Q000737:chemistry*; D003198:Computer Simulation; D003903:Deuterium / Q000737:chemistry*; D004583:Electrons; D007477:Ions; D008956:Models, Chemical; D008958:Models, Molecular; D013696:Temperature
chemical_list: D007477:Ions; D003903:Deuterium; D000079:Acetaldehyde