Photodissociation of HOD (νOD=3): Demonstration of preferential O-D bond breaking

Y. Cohen, I. Bar, S. Rosenwaks

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67 Scopus citations


It has been predicted that photodissociation of vibrationally excited HOD may preferentially yield either OD+H or D+OH, depending on the vibrational mode and the dissociation wavelength. To date, only the former preference has experimentally been demonstrated. In the present work preferential O-D bond breaking has been achieved from the photolysis of HOD (νOD=3) at 193 nm. HOD was prepared in a specific rovibrational level of the second overtone of the O-D stretch via infrared excitation. The subsequent photolysis led to enhancement of both OH and OD production, the OH/OD branching ratio being 2.6±0.5. The results agree with the predictions of Imre and co-workers [J. Phys. Chem. 93, 1840 (1989)] on the enhancement of νOD≥3 photodissociation but differ in the branching ratio obtained at the specific photolysis wavelength.

Original languageEnglish
Pages (from-to)3612-3616
Number of pages5
JournalJournal of Chemical Physics
Issue number9
StatePublished - 1 Jan 1995

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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