Dissociative Recombination of H3O+, HD2O+, and D3O+

Details Dissociative Recombination of H3O+, HD2O+, and D3O+ Dissociative Recombination of H3O+, HD2O+, and D3O+

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...543..764j&link_type=abstract

The Astrophysical Journal, Volume 543, Issue 2, pp. 764-774.

Astronomy and Astrophysics

Astronomy

65

Ism: Molecules, Methods: Laboratory, Molecular Data, Molecular Processes

Scientific paper

We present an experimental study of the dissociative recombination (DR) of H3O+ and its isotopomers D3O+ and HD2O+ performed at the ASTRID storage ring. DR cross sections have been measured as a function of energy, while complete branching ratios have been measured at E=0. The H3O+ data yield an accurate determination of the branching ratio for water formation (0.25+/-0.01). The three molecular ions-H3O+, D3O+, and HD2O+-show a marked resemblance concerning cross sections and branching ratios. The only observed isotope effect is in the fragmentation pattern of HD2O+, where the release of a light fragment is favored over release of a heavier fragment. As a consequence, an enhanced production of deuterated molecules takes place as a result of the DR process.

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