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Preference for breaking the O–H bond over the O–D bond following HDO ionization by fast ions

A M Sayler, M Leonard, K D Carnes, R Cabrera-Trujillo, B D Esry and I Ben-Itzhak

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Measurements of the fragmentation of deuterium tagged water molecules, namely HDO, by fast proton and F7+ impact exhibit a very strong isotopic preference for cleavage of the OH bond over the OD bond. Explicitly, the former is about five times more likely than the latter for HDO2+ dissociation. HDO+ exhibits similar behaviour, though the asymmetry is smaller at about a factor of 2. Wave-packet propagation calculations are in good agreement with the measured branching ratio for HDO2+ dissociation.


PACS

33.15.Fm Bond strengths, dissociation energies

82.30.Fi Ion-molecule, ion-ion, and charge-transfer reactions

34.80.Gs Molecular excitation and ionization

82.30.Lp Decomposition reactions (pyrolysis, dissociation, and fragmentation)

Subjects

Atomic and molecular physics

Chemical physics and physical chemistry

Dates

Issue 7 (14 April 2006)

Received 20 September 2005, in final form 9 February 2006

Published 20 March 2006



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