CAICISS and STM study of and tin phases on Si(1 0 0)

Tin (Sn) adsorption on Si(1 0 0) surface has been studied by scanning tunneling microscopy (STM) and co-axial impact collision ion scattering spectroscopy (CAICISS). The c ( 8 × 4 ) and ( 5 × 1 ) phases were analyzed to reveal their atomic structure. It has been confirmed that the c ( 8 × 4 ) structure consists of buckled Sn dimers. The ( 5 × 1 ) structure has been found to be partially irregular along ( 5 × 1 ) rows and to consist of double Sn layer. The Sn atoms in the first layer are undimerised while those in second layer form asymmetric dimers.