IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Tuesday Sessions
       Session SS3-TuP

Paper SS3-TuP5
The Simultaneous Observation of Adsorption Isobars of Xe/Ag(111) and Xe/Ag(100)

Tuesday, October 30, 2001, 5:30 pm, Room 134/135

Session: Adsorption/Desorption Poster Session
Presenter: A. Tosaka, Gakushuin University, Japan
Authors: A. Tosaka, Gakushuin University, Japan
T. Mitake, Gakushuin University, Japan
T. Hirayama, Gakushuin University, Japan
I. Arakawa, Gakushuin University, Japan
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The growth and the structure of a Xe film physisorbed on the surface of a silver single crystal, Ag(111) or Ag(100), have been investigated by means of an ellipsometry and an eXtremely-low-current LEED (XLEED). We obtained adsorption isobars of Xe/Ag(111) and Xe/Ag(100) simultaneously: one was observed by the ellipsometry and the other by the spot intensity measurement of XLEED in the temperature range between 60K and 90K and the equilibrium Xe pressure range between 5X10@super -6@Pa and 2X10@super -4@Pa. The first layer condensation of Xe/Ag(111) occurs at the temperature 0.3±0.1 K higher than that observed for Xe/Ag(100), while the second layer condensation occurs at the same temperature within the experimental accuracy . On the assumption (1) that this temperature difference is mainly caused by the difference of the induced dipole moment between the Xe atom on Ag(111) and that on Ag(100) and (2) that the system follows the two dimensional van der Waals equation, we calculated the difference of the induced dipole moment µ to reproduce the experimentally determined temperature difference. The result shows that µ on Ag(100) is 5% larger than that on Ag(111). @FootnoteText@ *T. Hirayama Present Address: Department of Physics, Rikkyo University, Toshima, 171-8501 JAPAN.