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Dissociations of water ions after valence and inner-valence ionization

Journal article
Authors Andreas Hult Roos
John H. D. Eland
Jonas Andersson
Richard J. Squibb
Raimund Feifel
Published in Journal of Chemical Physics
Volume 149
Pages 204307
ISSN 0021-9606
Publication year 2018
Published at Department of Physics (GU)
Pages 204307
Language en
Subject categories Molecular physics


Energy selected and mass‐resolved electron‐ion coincidence spectra of heavy water have been recorded for ionization energies from 18 to 35 eV. Dissociation from the B2B2 state produces both O+ and D2+ at energies near their thermodynamic thresholds in addition to the known products D+ and OD+. Relative yields of O+, OD+ and D+ in the B2B2 state breakdown diagram are modulated by the vibrational structure of the B‐state population, implying incomplete energy equilibration before fragmentation. Decay from the C‐state produces OD+ in addition to the known O+ and D+. The fragment kinetic energies suggest that O+ and D+ from the C state are products of full atomization of the molecule.

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