31 surfaces were investigated in the present work. The dynamic growth behavior was observed with low energy electron microscopy (LEEM), and the local surface structure change was monitored with selected area low energy electron diffraction (LEED). Xray generated photo emission electron microscopy using synchrotron radiation (SR-XPEEM) was employed in order to see the variation of the chemical state on the surface. On both p 3 × p 3 and p 31 × p 31 surfaces, Sb adsorption induces the surface structural change and modifies the chemical interaction of In atoms with Si. In atoms are replaced by impinged Sb atoms, and the discharged In atoms form islands.
Anomalous step contrast in low energy electron microscopy (LEEM) images observed during Pb deposition on a W(110) surface is discussed. The steps are dark on the clean surface, and become bright by Pb deposition at about 200 °C. The contrast reversal is related to the presence of a two-dimensional (2D) Pb gas on the surface and its atomic density distribution. Upon further deposition the steps become dark again and show an anomalous intensity profile. This change is attributed to the 2D crystallization process.
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