Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.97: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

H-Adsorption and surface resonances on Pd and Pt — •Alexander Menzel¹, Peter Amann¹, Michael Cordin¹, Erminald Bertel¹, Josef Redinger², Sebastian Stolwijk³, Karen Zumbrägel³, and Markus Donath³ — ¹Inst. f. Phys. Chemie, Univ. Innsbruck, Austria. — ²Dep. of Appl. Physics, Techn. Univ. Wien, Austria. — ³Physikal. Institut, Univ. Münster, Germany

In this contribution, the influence of Hydrogen adsorption on the isoelectronic surfaces Pt(110) and Pd(110) is observed with ARPES (in some cases spin resolved) and compared with DFT-calculations. A strong surface resonance at S can be identified experimentally in ARPES by backfolding due to adsorbate-induced changes of surface-symmetry. Whereas Hydrogen adsorption induces no energetic shift of the surface resonance at S in Pt(110), a downward shift on Pd(110) is observed. This difference is related to the different adsorption sites for hydrogen on both surfaces and compares favourably with DFT calculations [2]. Interestingly, upon hydrogen adsorption a pairing-row reconstruction on Pd(110) develops together with a satellite peak of the S resonance. The band dispersion of this satellite is parallel to the dispersion of the main resonance, but is shifted to lower energies by roughly 400meV. The spectra resemble Ni(110), however, a spin polarization could not be detected. Possible origins of the satellite peak are discussed.

References: [1] M. Minca, S. Penner, E. Dona, A. Menzel, E. Bertel, V. Brouet and J. Redinger, New J. Phys. 9, 386 (2007). [2] W. Dong, V. Ledentu, Ph. Sautet, A. Eichler, J. Hafner, Surf. Sci. 411, 123 (1998).