Photoelectron diffraction investigation of the local adsorption site of N on Cu(111)

Scanned-energy mode photoelectron diffraction has been used to investigate the local structure of N adsorbed on Cu(111). The results favour an N-induc ed pseudo-(100) reconstruction as proposed previously, but indicate that th is comprises two reconstructed Cu layers. The N atoms occupy hollow sites a pproximately coplanar with the outermost pseudo-(100) layer at a height of about 2 Angstrom above a Cu atom from the underlying pseudo-(100) layer; th e N atoms thus have fivefold co-ordination.