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The interaction of oxygen with alkalis (Na, K) on Ni(111) was studied by high-resolution electron energy loss spectroscopy. Loss measurements revealed for the first time a softening of the O–Ni bond and, simultaneously, a strengthening of the alkali-Ni bond in the alkali+O coadsorbed phase, in perfect agreement with recent theoretical calculations. The weakening of the O–Ni bond was ascribed to the alkali-induced filling of the O 2pz antibonding orbitals. Different physical mechanisms were discussed for explaining the strengthening of the alkali-substrate bond whenever alkalis are coadsorbed with O adatoms.
American Institute of Physics
Publication date: 
21 Feb 2008

A Politano, V Formoso, RG Agostino, E Colavita, G Chiarello

Biblio References: 
Volume: 128 Issue: 7 Pages: 074703
The Journal of chemical physics