Journal of Vacuum Science & Technology A Vacuum Surfaces and Films · 1987 · 10 citations · 0 references
Natural SciencesChemistryMaterials SciencePhysical ChemistrySurface ChemistrySurface ScienceIron OxidesOxidation ReactionsOxidation-reduction ReactionsRedox ChemistrySurface OxidationSurface PhysicsActivation EnergyApparent Activation EnergyFirst-order ReactionHydrogen ReductionLow-energy Electron SpectroscopyOxidation-reduction InterfacesReduction ProcessesSurface Reduction Reactions
The reduction of oxidized Fe (110) by hydrogen has been studied by ellipsometry, combined with Auger electron spectroscopy and low-energy electron diffraction (LEED). Oxide island formation occurs after partial reduction of oxidized Fe(110) by hydrogen, as was observed with LEED. At this stage the reaction rate becomes first order in the hydrogen pressure. When compared with the results obtained on Fe(100), it appeared that the reaction probability and the apparent activation energy of the reduction processes are of the same order of magnitude for both surfaces. However, a striking example of plane specific reaction behavior was observed, since the reduction on Fe(100) is incomplete, approximately one monolayer of oxygen remaining on the surface, whereas on Fe(110) the reaction proceeds quantitatively under similar reaction conditions.