Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD3OCD2+ and (CD3)2OD+

Details Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD3OCD2+ and (CD3)2OD+ Experimental studies of the dissociative recombination processes for the dimethyl ether ions CD3OCD2+ and (CD3)2OD+

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...514a..83h&link_type=abstract

Astronomy and Astrophysics, Volume 514, id.A83

Astronomy and Astrophysics

Astrophysics

4

Astrochemistry, Molecular Processes, Plasmas, Methods: Laboratory, Methods: Numerical, Ism: Molecules

Scientific paper

Aims: Determination of branching fractions, cross sections and thermal rate coefficients for the dissociative recombination of CD3OCD2+ (0-0.3 eV) and (CD3)2OD+ (0-0.2 eV) at the low relative kinetic energies encountered in the interstellar medium. Methods: The measurements were carried out using merged electron and ion beams at the CRYRING storage ring, Stockholm, Sweden. Results: For (CD3)2OD+ we have experimentally determined the branching fraction for ejection of a single hydrogen atom in the DR process to be maximally 7% whereas 49% of the reactions involve the break up of the COC chain into two heavy fragments and 44% ruptures both C-O bonds. The DR of CD3OCD2+ is dominated by fragmentation of the COC chain into two heavy fragments. The measured thermal rate constants and cross sections are k(T) = 1.7±0.5 × 10-6(T/300)-0.77±0.01 cm3 s-1, σ = 1.2±0.4 × 10-15(Ecm[eV])-1.27±0.01 cm2 and k(T) = 1.7±0.6 × 10-6(T/300)-0.70 ± 0.02 cm3 s-1, σ = 1.7±0.6 × 10-15(Ecm[eV])-1.20±0.02 cm2 for CD3OCD2+ and (CD3)2OD+, respectively.

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