ULTRATHIN Al FILM ON THE W(100) SURFACE

We have investigated Al adsorption on the W (100) surface using LEED and low energy Ion Scattering Spectroscopy (ISS). We observe a p(2 × 1) double domain LEED image for the 1.0 ML Al/W (100) surface at annealing temperature 850°C. We also measured the Al adsorption site at the Al/W (100) — p(2 × 1) surface using ISS. It is found that Al atoms adsorbed at 0.7±0.1 Å aside from the center of the bridge sites with a zigzag structure — one atom adsorbs at the right-hand side and next atom at the left-hand side along the [100] direction. The height of the adsorbed Al atoms is determined to be 1.75±0.15 Å above the W surface layer.