title: Dissociative recombination of the acetaldehyde cation, CH(3)CHO(+).
abstract: The dissociative recombination of the acetaldehyde cation, CH(3)CHO(+), has been investigated at the heavy ion storage ring CRYRING at the Manne Siegbahn Laboratory in Stockholm, Sweden. The dependence of the absolute cross section of the reaction on the relative kinetic energy has been determined and a thermal rate coefficient of k(T) = (1.5 ± 0.2) × 10(-6) (T/300)(-0.70±0.02) cm(3) s(-1) has been deduced, which is valid for electron temperatures between ∼10 and 1000 K. The branching fractions of the reaction were studied at ∼0 eV relative kinetic energy and we found that breaking one of the bonds between two of the heavy atoms occurs in 72 ± 2% of the reactions. In the remaining events the three heavy atoms stay in the same product fragment. While the branching fractions are fairly similar to the results from an earlier investigation into the dissociative recombination of the fully deuterated acetaldehyde cation, CD(3)CDO(+), the thermal rate coefficient is somewhat larger for CH(3)CHO(+). Astrochemical implications of the results are discussed.
authors: Department of Physics, AlbaNova, Stockholm University, SE-10691 Stockholm, Sweden.
authors: Erik
authors: E
authors: Vigren
authors: Mathias
authors: M
authors: Hamberg
authors: Vitali
authors: V
authors: Zhaunerchyk
authors: Magdalena
authors: M
authors: Kaminska
authors: Richard D
authors: RD
authors: Thomas
authors: Sebastian
authors: S
authors: Trippel
authors: Mingwu
authors: M
authors: Zhang
authors: Iryna
authors: I
authors: Kashperka
authors: Magnus Af
authors: MA
authors: Ugglas
authors: Catherine
authors: C
authors: Walsh
authors: Roland
authors: R
authors: Wester
authors: Jacek
authors: J
authors: Semaniak
authors: Mats
authors: M
authors: Larsson
authors: Wolf D
authors: WD
authors: Geppert
mesh_terms: D000079:Acetaldehyde / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D007700:Kinetics; D013696:Temperature
chemical_list: D002412:Cations; D000079:Acetaldehyde