The model catalyst surface of ultra-thin films of CuCl deposited at room temperature upon TiO2(110) was studied by ultra-violet photo-electron spectroscopy, electron energy-loss spectroscopy, Auger electron spectroscopy and low energy electron diffraction. The CuCl deposition induced a (4 x 1) substrate reconstruction. CuCl molecules were adsorbed on the surface with the Cu-end downwards. The Cu(3d) levels of adsorbates re-hybridize with the substrate O (2p) levels, resulting in a narrowing of the band gap located between the Cu(3d) and Cl(3p) occupied valence states of the molecule.

Ultrathin Films of CuCl on TiO2(110) - Electronic Structure and Surface Reconstruction. Wu, M., Guo, Q., Møller, P.J.: Vacuum, 1990, 41[4-6], 1418-21