AVS 50th International Symposium
    Surface Science Wednesday Sessions
       Session SS-WeP

Paper SS-WeP4
Ellipsometric and XLEED Observation of Growth and Structure of Xenon and Krypton Films on the Surface of Silver Single Crystals

Wednesday, November 5, 2003, 11:00 am, Room Hall A-C

Session: Poster Session
Presenter: A. Tosaka, Gakushuin University, Japan
Authors: A. Tosaka, Gakushuin University, Japan
T. Mitake, Gakushuin University, Japan
K. Ishii, Gakushuin University, Japan
M. Sato, Gakushuin University, Japan
T. Miura, Gakushuin University, Japan
I. Arakawa, Gakushuin University, Japan
Correspondent: Click to Email
The layering growth and the structure of Xe and Kr films on Ag(111), Ag(100) and Ag(110) has been observed by means of ellipsometry and eXtremely-low-current Low Energy Electron Diffraction (XLEED) under the quasi-equilibrium condition from a submonolayer to a thick film. We chose the surfaces of Ag(111), Ag(100) and Ag(110) as the substrates in order to investigate the effect of the substrate geometry on the overlayer growth and structure. In the case of Xe/Ag(111) and Kr/Ag(111), it was confirmed that the overlayer is incommensurate with the substrate while the unit vectors of the Xe or Kr overlayer align with those of the substrate. This alignment is likely due to the pinning of overlayer at the steps of the substrate surface.@footnote 1@ We found that there were two types of alignment of a Xe or Kr overlayer on Ag(100): the unit vector of the overlayer was along <001> of Ag in one alignment and along <011> in the other. It was observed that Xe and Kr films on Ag(110) had centered-rectangular structure, which is uniaxially commensurate with [001] of Ag, just after the first layer condensation. In the case of Xe/Ag(110), lowering the sample temperature or raising the surrounding pressure brings out the uniaxial compression of Xe film along [110] of Ag. After this uniaxial compression along [110], the compression along [001] of Ag commenced. Finally, the Xe-Xe spacing reached to the bulk value before the second layer condensation. On the other hand, in the case of Kr/Ag(110), such compression did not observed in monolayer. @FootnoteText@ @footnote 1@G. S. Leatherman, R. D. Diehl, M. Karimi and G. Vidali: Phys. Rev. B 56 (1997) 6970.