Photoemission and LEED investigation of the initial growth of Cr on Ag()

Abstract The initial growth of Cr on a Ag(0 0 1) surface is studied by low energy electron diffraction (LEED), angle resolved ultra-violet photoemission and X-ray photoelectron diffraction, as a function of deposition temperature. At 100 K, the LEED diagram is p(1×1) and a highly defected monolayer is initially formed. When the substrate is kept at room temperature during Cr evaporation, the LEED pattern is still p(1×1), and multilayer growth with markedly improved atomic order and accompanied by Ag segregation occurs. In contrast, at 430 K, a weak c(2×2) LEED diagram is obtained at low electron energies (