Striking Isotopologue-Dependent Photodissociation Dynamics of Water Molecules: The Signature of an Accidental Resonance

Yao Chang, Zhichao Chen, Jiami Zhou, Zijie Luo, Zhigang He, Guorong Wu, Michael N.R. Ashfold, Kaijun Yuan, Xueming Yang

Research output: Contribution to journalArticle (Academic Journal)

3 Citations (Scopus)
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Abstract

Investigations of the photofragmentation patterns of both light and heavy water at the state-to-state level are a prerequisite for any thorough understanding of chemical processing and isotope heterogeneity in the interstellar medium. Here we reveal dynamical features of the dissociation of water molecules following excitation to the C̃(010) state using a tunable vacuum ultraviolet source in combination with the high-resolution H(D)-atom Rydberg tagging time-of-flight technique. The action spectra for forming H(D) atoms and the OH(OD) product state distributions resulting from excitation to the C̃(010) states of H2O and D2O both show striking differences, which are attributable to the effects of an isotopologue-specific accidental resonance. Such accidental-resonance-induced state mixing may contribute to the D/H isotope heterogeneity in the solar system. The present study provides an excellent example of competitive state-to-state nonadiabatic decay pathways involving at least five electronic states.
Original languageEnglish
Article number15
Pages (from-to)4209-4214
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume10
Early online date11 Jul 2019
DOIs
Publication statusPublished - 1 Aug 2019

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