Photoemission spectroscopy study of Na-induced phase transitions on Si(1Â 1Â 3)

We reinvestigate the Si 2p spectrum of clean Si(113)3×2 to testify two competitive structure models, i.e. adatom-dimer-interstitials and oppositely puckered models, in comparison with recent theoretical calculations. This reveals that only the adatom-dimer-interstitials model reproduces the surface components of the Si 2p spectrum. After decorating Na atoms on clean Si(113)3×2 at room temperature, the 3×2 phase was found to transit into the 3×1 phase by low-energy electron diffraction and photoemission spectroscopy experiments. We will discuss the (3×2)-(3×1) phase transition on the adatom-dimer-interstitials model.