Electron-stimulated reactions at the interfaces of amorphous solid water films driven by long-range energy transfer from the bulk

The electron-stimulated production of D2 from amorphous solid D2O deposited on Pt(111) is investigated as a function of film thickness. The D2 yield has two components that have distinct reaction kinetics. Using isotopically layered films of H2O and D2O demonstrates that the D2 is produced in reacti...

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Bibliographic Details
Published in:Physical review letters 2003-04, Vol.90 (16), p.166102-166102, Article 166102
Main Authors: Petrik, Nikolay G, Kimmel, Greg A
Format: Article
Language:English
Subjects:
Deuterium - chemistry
Deuterium Oxide - chemistry
Electrons
Energy Transfer
Hydrogen - chemistry
Radiobiology
Water - chemistry
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Summary:The electron-stimulated production of D2 from amorphous solid D2O deposited on Pt(111) is investigated as a function of film thickness. The D2 yield has two components that have distinct reaction kinetics. Using isotopically layered films of H2O and D2O demonstrates that the D2 is produced in reactions that occur at both the Pt/amorphous solid water (ASW) interface and the ASW/vacuum interface, but not in the bulk. The energy for the reactions, however, is absorbed in the bulk of the films and electronic excitations diffuse to the interfaces where they drive the reactions.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.90.166102