corner
corner
APS » Journals » Phys. Rev. Lett. » Volume 87 » Issue 3
< Previous Article | Next Article >

Phys. Rev. Lett. 87, 036103 (2001) [4 pages]

Adsorption Sites and Ligand Effect for CO on an Alloy Surface: A Direct View

Download: PDF (479 kB) Buy this article Export: BibTeX or EndNote (RIS)

Y. Gauthier1, M. Schmid2,*, S. Padovani1, E. Lundgren2,†, V. Buš3, G. Kresse4, J. Redinger5, and P. Varga2
1Laboratoire de Cristallographie, CNRS, BP 166 X, F-38042 Grenoble Cedex 09, France
2Institut für Allgemeine Physik, Technische Universität Wien, A-1040 Wien, Austria
3Institute of Physical Engineering, Brno University of Technology, CZ-61669 Brno, Czech Republic
4Institut für Materialphysik, Universität Wien, Sensengasse 8, A-1090 Wien, Austria
5Center for Computational Materials Science, E158, Technische Universität Wien, A-1060 Wien, Austria

Received 15 January 2001; published 28 June 2001

CO adsorption on a PtCo(111) surface was studied by scanning tunneling microscopy. Comparison of images with chemical contrast of Pt and Co and images showing the CO molecules indicates that CO resides exclusively on top of Pt sites and never on Co. CO bonding is highly sensitive to the chemical environment. The probability to find CO on a Pt atom increases drastically with the number of its Co nearest neighbors. Ab initio calculations show that this ligand effect is due to different positions of the center of the Pt d band.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.036103
DOI:
10.1103/PhysRevLett.87.036103
PACS:
68.43.Fg, 68.37.Ef, 68.43.Bc, 73.20.At

*Corresponding author. Email address: schmid@iap.tuwien.ac.at

†Present address: Department of Synchrotron Radiation Research, Institute of Physics, Lund University, Lund, Sweden.

 
< Previous Article | Next Article >