Abstract
Adsorption of O 2 on W(111) at temperatures down to 5 K is studied using molecular beam (MB) and thermodesorption spectroscopy (TD) methods. The low-temperature TD spectra for the molecularly adsorbed O 2 on W(111) contain three peaks at 25, 27 and 60 K corresponding respectively to multilayer condensation, physisorption and weak molecular chemisorption. The role of the substrate structure for the O 2 chemisorption is discussed on the basis of present results for W(111) and earlier data for different metal surfaces. Field-effect on the O 2W(111) interaction is studied using field ion appearance energy spectroscopy (FIAES) of O + 2 ions emitted from the apex plane of a [111]-oriented W field emitter tip. Applying a thermionic cycle, field-modified binding energies for O 2 W(111) are derived from the O + 2 appearance energies measured at 79 K. FIAES data reveals a field-adsorbed O 2 layer as the origin of O + 2 field ions emitted from W(111) for field ion imaging.
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