Chemisorbed ordered oxygen overlayer on AL(111): An angular resolved photoemission study

Chemisorbed oxygen atoms on aluminum induce a strong O 2p derived surface resonance. On the (111) crystal face the oxygen atoms form an ordered overlayer of (1x1) symmetry. The O 2p resonance in this system has been studied using angle resolved photoemission. The results indicate one of the threefold centered hollow sites as the probable site of chemisorption. At normal electron emission, the O 2p resonance is sharp and symmetric. Strong dispersion effects are seen at non-normal emission indicating appreciable oxygen-oxygen interaction in the chemisorbed layer.