Low-coverage ordered phases of hydrogen on Ni(110)

Three new submonolayer phases of hydrogen on Ni(110) with periodicities $c(2\mathrm{}\times 6)$, $c(2\mathrm{}\times 4)$, and $c(2\mathrm{}\times 6)$ and respective coverages $\frac{1}{3}$, ½, and $\frac{2}{3}$ monolayers were observed and analyzed with the use of He-diffraction techniques. The corrugation functions provide a direct picture of the adatom configurations and give further insight into the interplay of adatom-substrate and adatom-adatom interactions at adsorbate densities up to one monolayer.