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O: Oberflächenphysik
O 36: Postersitzung (Elektronische Struktur, Grenzfl
äche fest-flüssig, Halbleiteroberfl
ächen und -grenzfl
ächen, Nanostrukturen, Oberfl
ächenreaktionen, Teilchen und Cluster, Struktur und Dynamik reiner Oberfl
ächen)
O 36.2: Poster
Montag, 7. März 2005, 15:00–18:00, Poster TU F
H/Pt(110): Atypical chemisorption and its influence on quasi-one-dimensional surface states — •Alexander Menzel1, Enrico Dona1, Mariana Minca1, Zhenrong Zhang1, Erminald Bertel1, Rinaldo Zucca2, and Josef Redinger2 — 1Phys. Chemie, Univ. Innsbruck, A-6020 Innsbruck — 2CCMS, TU Wien, A-1060 Vienna
The quasi-one-dimensional (Q1D) model system Pt(110) is investigated with respect to changes induced by hydrogen adsorption. In striking contrast to the usual expectation of highly coordinated chemisorption sites [2], we show experimental and theoretical evidence that H initially chemisorbs at the low coordinated short bridge site on top of the outermost platinum rows. The experimental results on geometry (I/V-LEED), adsorption (TPD) and electronic structure (ARUPS) are supplemented by an ab-initio calculation of the chemisorption geometry [3]. The analysis reveals a strong coupling of the H atom positions to Pt lattice relaxations on the (1x2) missing row surface and an extreme sensibility of the Q1D electronic features upon hydrogen adsorption.
Support by the Austrian Science Fund (FWF) is gratefully acknowledged.
[1] E. Kirsten, G. Parschau,W. Stocker, and K. Rieder, Surf. Sci. 231, L183 (1990)
[2] G. Burns, Solid State Physics (Academic, New York, 1985); K.Christmann, Surf. Sci. Rep. 9, 1 (1988).
[3] Z. Zhang et al, Phys. Rev. B 70, 121401 (2004).