Regensburg 2007 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Metal Substrates: Adsorption V

O 68.1: Vortrag

Freitag, 30. März 2007, 10:15–10:30, H39

Argon adsorbed on Ag(111) — •Thomas König, Markus Heyde, Hans-Peter Rust, and Hans-Joachim Freund — Fritz-Haber-Institute of the Max-Planck-Society, Faradayweg 4-6, D-14195 Berlin, Germany

The adsorption of Xe on Ag(111) has been a an interesting task since many years [1,2]. We found that investigations about Ar on Ag(111) are less spread. Here we present the preparation and scanning tunnelling microscopy (STM) characterization of Ar on Ag(111). Our employed setup is similar to the one developed by P.S. Weiss et al. [3] and used by Rust et al. [4]. Characteristic of this setup is a pendulum. The pendulum is thermally coupled to a liquid helium dewar. The preparation of the Ar on Ag(111) was accomplished in a special manner. An Ag(111) sample at room temperature was transferred in the cold microscope located at the end of the pendulum. The pendulum and microscope was pre-dosed by Ar before. The hot Ag(111) sample warms the sample holder from where Ar desorbs. Ar-islands or an Ar-film that covers the surface fully can be observed depending on the concentration of Ar. The electronic structures are mapped by STM measurements. A statistical analysis of the Ar-islands and their formation will be shown. The closed Ar-film shows symmetry properties that will be discussed.

[1] J. Unguris, L.W. Bruch, E.R. Moog, M.B. Webb, Surf. Sci. 109, 522 (1981). [2] M. Caragiu, G.S. Leatherman, Th. Seyller, R.D. Diehl, Surf. Sci. 475, 89 (2001). [3] P.S. Weiss, D.M. Eigler, NATO ASI Series E, 235, 213 (1993). [4] H.-P. Rust, J. Busisset, E.K. Schweizer, L. Cramer, Rev. Sci. Instrum. 68, 129 (1997).