Experimental studies of the dissociative recombination of CD3CDOD+ and CH3CH2OH2+

Details Experimental studies of the dissociative recombination of CD3CDOD+ and CH3CH2OH2+ Experimental studies of the dissociative recombination of CD3CDOD+ and CH3CH2OH2+

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...522a..90h&link_type=abstract

Astronomy and Astrophysics, Volume 522, id.A90

Astronomy and Astrophysics

Astrophysics

1

Astrochemistry, Molecular Processes, Plasmas, Methods: Laboratory

Scientific paper

Aims: We determine branching fractions, cross sections and thermal rate constants for the dissociative recombination of CD3CDOD+ and CH3CH2OH2+ at the low relative kinetic energies encountered in the interstellar medium. Methods: The experiments were carried out by merging an ion and electron beam at the heavy ion storage ring CRYRING, Stockholm, Sweden. Results: Break-up of the CCO structure into three heavy fragments is not found for either of the ions. Instead the CCO structure is retained in 23 ± 3% of the DR reactions of CD3CDOD+ and 7 ± 3% in the DR of CH3CH2OH2+, whereas rupture into two heavy fragments occurs in 77 ± 3% and 93 ± 3% of the DR events of the respective ions. The measured cross sections were fitted between 1-200 meV yielding the following thermal rate constants and cross-section dependencies on the relative kinetic energy: σ(Ecm[eV]) = 1.7 ± 0.3 × 10-15 (Ecm[eV])-1.23 ± 0.02 cm2 and k(T) = 1.9 ± 0.4 × 10-6 (T/300)-0.73 ± 0.02 cm3 s-1 for CH3CH2OH2+ as well as k(T) = 1.1 ± 0.4 × 10-6 (T/300)-0.74 ± 0.05 cm3 s-1 and σ(Ecm[eV]) = 9.2 ± 4 × 10-16 (Ecm[eV])-1.24 ± 0.05 cm2 for CD3CDOD+

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