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Abstract:
Angle-resolved ultraviolet photoelectron spectroscopy (ARUPS), thermal desorption spectroscopy (TDS) and low energy electron diffraction (LEED) have been utilized to study molecularly adsorbed N2 on thin (110) oriented Fe layers grown on W(110). Layers with thicknesses of up to 2 monolayers acquire the lattice constant of the substrate which is by 10.4% larger than that of iron. These strained layers show different properties than the bulk Fe(110) surface. To our knowledge no molecularly adsorbed N2 species on bulk Fe(110) is reported in the literature at T ≥ 80K, whereas on the pseudomorphically grown iron layers on W(110) we observe a molecularly adsorbed species which stands upright on the surface. Pseudomorphically grown Fe layers on W(110) show a strongly enhanced dissociation probability for adsorbed N2 which we attribute to the open structure of the strained surface. For comparison also results for thick Fe(110) layers, which resemble the structure of an unstrained Fe(110) surface, are reported.
