When Scanning Tunneling Microscopy Gets the Wrong Adsorption Site: H on Rh(100)

Autor:	Michael Schmid, Peter Varga, A. Eichler, Gernot Pauer, E.L.D. Hebenstreit, R. Koller, Adolf Winkler, C Klein
Rok vydání:	2003
Předmět:	Materials science Hydrogen Thermal desorption spectroscopy Scanning tunneling spectroscopy General Physics and Astronomy chemistry.chemical_element law.invention Adsorption Electron diffraction chemistry Chemical physics law Density functional theory Scanning tunneling microscope Quantum tunnelling
Zdroj:	Physical Review Letters. 90
ISSN:	1079-7114 0031-9007
DOI:	10.1103/physrevlett.90.176101
Popis:	At low tunneling resistance, scanning tunneling microscopy (STM) images of a Rh(100) surface with adsorbed hydrogen reproducibly show protrusions in all bridge sites of the surface, leading to a naive interpretation of all bridge sites being occupied with H atoms. Using quantitative low-energy electron diffraction and temperature programmed desorption we find a much lower H coverage, with most H atoms in fourfold hollow sites. Density functional theory calculations show that the STM result is due to the influence of the tip, attracting the mobile H atoms into bridge sites. This demonstrates that STM images of highly mobile adsorbates can be strongly misleading and underlines the importance of additional analysis techniques.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e0bd1f52a7e48368fe73893b8bb2385 https://doi.org/10.1103/physrevlett.90.176101 Zobrazit plný text záznamu