Low energy electron diffraction measurements were carried out on clean and Te-covered Pd(102) surfaces. This was the surface into which the Pd(100) surface was reconstructed by a concentration of more than 0.5ML of Te. The Pd(102) surface was produced with a terrace width of more than 1000Å. Up to 0.5ML the adsorption of Te takes place on the flat (102) surface, on which islands with (2 x 1) structure were formed coupled with a reduction of the terrace widths to about half the initial value. Above 0.5ML, and up to 1ML, the adsorbed Te atoms produce a structural change of the surface, i.e. a terrace structure was formed with a clear average terrace length that depends on Te concentration and with step edges in [¯201] direction. As concluded from the characteristic splitting of low-energy electron diffraction spots as a function of energy, these terraces occupy only two height levels in an alternating sequence and were separated by steps of single atomic height. The terrace width of the alternating terraces increases with increasing Te-concentration. Again a flat surface was formed at 1ML of Te.

Adsorbate Induced Mesoscopic Surface Reconstruction of the System Te/Pd(102). G.Godzik, H.Pfnür: Surface Science, 2001, 489[1-3], 126-34