Electron-stimulated reactions in nanoscale water films adsorbed on α-Al2O3 (0001)

Petrik, Nikolay G.; Kimmel, Gregory A.

doi:10.1039/C8CP01284A

Title: Electron-stimulated reactions in nanoscale water films adsorbed on α-Al₂O₃ (0001)

Journal Article · Mon Jan 01 00:00:00 EST 2018 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/C8CP01284A· OSTI ID:1439011

Petrik, Nikolay G.; Kimmel, Gregory A.

The radiation-induced decomposition and desorption of nanoscale amorphous solid water (D2O) films adsorbed on -Al2O3(0001) surface was studied at low temperature in ultrahigh vacuum using temperature programmed desorption (TPD) and electron stimulated desorption (ESD) with a mono-energetic, low energy electron source. ESD yields of molecular products ( D2, O2 and D¬2O) and the total sputtering yield increased with increasing D2O coverage up to ~15 water monolayers (i.e. ~15 1015 cm-2) to a coverage-independent level for thicker water films. Experiments with isotopically-layered water films (D2O and H2O) demonstrated that the highest water decomposition yields occurred at the interfaces of the nanoscale water films with the alumina substrate and vacuum. However, the increased reactivity of the water/alumina interface is relatively small compared to the enhancements in the non-thermal reactions previously observed at the water/Pt(111) and water/TiO2(110) interfaces. We propose that the relatively low activity of Al2O3(0001) for the radiation-induced production of molecular hydrogen is associated with lower reactivity of this surface with hydrogen atoms, which are likely precursors for the molecular hydrogen.100 eV electrons are stopped in the H₂O portion of the isotopically-layered nanoscale film on α-Al₂O₃(0001) but D₂is produced at the D₂O/alumina interface by mobile electronic excitations and/or hydronium ions.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Interfacial Dynamics in Radioactive Environments and Materials (IDREAM); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1439011

Report Number(s):: PNNL-SA-132648; PPCPFQ; KC0307010

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Vol. 20, Issue 17; ISSN 1463-9076

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

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