Electron-stimulated production of molecular oxygen in amorphous solid water on Pt(111): Precursor transport through the hydrogen bonding network

摘要: The low-energy, electron-stimulated production of molecular oxygen from thin amorphous solid water (ASW) films adsorbed on Pt(111) is investigated. For ASW coverages less than ∼60 ML, the O2 desorption (ESD) yield depends coverage in a manner that very similar to H2 ESD yield. In particular, both and yields have pronounced maximum at ∼20 ML due reactions Pt/water interface. dose dependent several precursors (OH, H2O2, HO2) are involved production. Layered H216O H218O used profile spatial distribution leading within films. Independent film thickness, final occur or near ASW/vacuum However, for ∼40 results indicate dissociation molecules ASW/Pt interface contributes presumably via th...