Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 12: Postersitzung (Struktur und Dynamik reiner Oberfl
ächen, Grenzfl
äche fest-flüssig, Nanostrukturen, Teilchen und Cluster, Halbleiteroberfl
ächen und Grenzfl
ächen, Zeitaufgelöste Spektroskopie, Rastersondentechniken, Methodisches)

O 12.3: Poster

Montag, 24. März 2003, 18:00–21:00, P1

The surface structure of Re (10-10) revisited — •Christian Pauls, Sebastian Schwede, Rainer Kickbusch, and Klaus Christmann — Institut für Chemie, Physikalische und Theoretische Chemie, FU Berlin, Takustr.3, 14195 Berlin

We performed LEED I(V) and LEED I(T) measurements with a clean rhenium(10-10) surface between 300 K and 1000 K. The LEED I(V) data were analyzed using the TensorLEED approximation developed by van Hove and Barbieri [1]. Compared to a previous study by Davis and Zehner [2] we extended the data basis to 800 eV and find a first-layer contraction of -12.2 % with respect to the ideal truncated bulk value. This number has to be compared to the -17 % reported 20 years ago by Davis and Zehner. In agreement with these authors we determine the less corrugated A-termination of the hcp(10-10) surface. Surface Debye temperatures were determined by a kinematical approximation of the measured temperature dependence of the (0,0) LEED beam resulting in values of 170 K for the first and 200 K for the second Re layer.

[1] M. A. van Howe et al. Surface Science Reports 19:191, 1993. [2] H. L. Davis and D.M. Zehner. J. Vac. Sci. Technol. 17:190, 1980.