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VOLUME 92 | ISSUE 7 | PAGE 495
Initial stage of flourofullerene molecules adsorption on Si surface
A. I. Oreshkin^{+\triangle*}, R. Z. Bakhtizin*, P. Murugan^\nabla, V. Kumar^\square, N. Fukui^\triangle, T. Hashizume^{\triangle\diamondsuit}, T. Sakurai°

+Moscow State University, Department of Physics, 119992 Moscow, Russia
*Department of Physical Electronics, Bashkir State University, 450074 Ufa, Russia
^\nablaCentral Electrochemical Research Institute, 630006 Karaikudi, Tamil Nadu, India
^\squareDr. Vijay Kumar Foundation, 1969 Sector 4, 122001 Gurgaon, Haryana, India
^\triangleWPI-AIMR, Tohoku University 2-1-1 Katahira, Aoba-ku, 980-8577 Sendai, Japan
^\diamondsuitAdvanced Research Laboratory, Hitachi, Ltd. Hatoyama, 350-0395 Saitama, Japan
°Tohoku University 2-1-1 Katahira, Aoba-ku, 980-8577 Sendai, Japan

Abstract
Spatially resolved images of an individual C60F18 fluorofullerene molecule on Si(100)-2 \times 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\times1 surface with F atoms pointing down towards the surface. The adsorption energy of a C60F18 molecule on Si(100)-2\times1 surface is \sim12.1 eV, which is much higher than the adsorption energy of the same molecule on Si(111)-7\times7 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\times1 surface.


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