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VOLUME 92 (2010) | ISSUE 7 | PAGE 495
Initial stage of flourofullerene molecules adsorption on Si surface
Spatially resolved images of an individual  C60F18 fluorofullerene molecule on Si(100)-2 × 1 surface have been obtained using scanning tunneling microscopy (STM). STM results and ab initio calculations show that the fluorofullerene molecules interact with the Si(100)-2×1 surface with F atoms pointing down towards the surface. The adsorption energy of a C60F18 molecule on Si(100)-2×1 surface is \sim12.1 eV, which is much higher than the adsorption energy of the same molecule on Si(111)-7×7 surface (6.65 eV).  C60F18 molecules are located in the troughs in-between the dimer rows occupying the four-dimer site on Si(100)-2×1 surface.