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O: Oberflächenphysik

O 18: Rastersondentechniken II

O 18.1: Talk

Tuesday, March 25, 2003, 11:15–11:30, M\"UL/ELCH

Surface State versus Tip-Sample Distance in a Scanning Tunneling Microscope — •Laurent Limot¹, Thomas Maroutian¹, Peter Johansson², and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany — ²Department of Natural Sciences, University of Örebro, S-70182, Örebro, Sweden

Scanning Tunneling Microscopy (STM) has revealed new and interesting aspects of surface states on noble metals, such as defect scattering, lateral confinement, surface state mediated interactions and the lifetime of these states. We report a quantitative low-temperature STM spectroscopy study on Ag(111) over a wide range of tunneling currents enabling us to probe the surface state of Ag(111) over an uprecedented range of tip-sample distances. The excellent agreement found with our one-dimensional potential model calculation allows a better understanding of the surface state wavefunction.