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Geminate recombination of electrons generated by above-the-gap (12.4 eV) photoionization of liquid water

Authors
Journal
Chemical Physics Letters
0009-2614
Publisher
Elsevier
Publication Date
Volume
398
Identifiers
DOI: 10.1016/j.cplett.2004.09.081
Disciplines
  • Physics

Abstract

Abstract The picosecond geminate recombination kinetics for hydrated electrons generated by 200 nm two photon absorption (12.4 eV total energy) has been measured in both light and heavy water. The geminate kinetics are observed to be almost identical in both H 2O and D 2O. Kinetic analysis based upon the independent reaction time approximation indicates that the average separation between the electron and its geminate partners in D 2O is 13% narrower than in H 2O (2.1 vs. 2.4 nm). These observations suggest that, even at this high ionization energy, autoionization of water competes with direct ionization.

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