Tip-dependent contrast in STM imaging of adsorbed sulfur layers: theory and experiment

Sulfur atoms adsorbed on the Re(0001) surface from several different ordered structures as a function of sulfur coverage. Sudden changes in the detailed appearance of atomic-resolution STM images of these structures have been observed. Theoretical image simulations using electron scattering quantum...

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Veröffentlicht in:	Ultramicroscopy 1992, Vol.42 (A), p.490-497
Hauptverfasser:	Dunphy, J.C., Ogletree, D.F., Salmeron, M.B., Sautet, P., Bocquet, M.-L., Joachim, C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Catalysis Chemical Sciences Condensed matter: structure, mechanical and thermal properties Exact sciences and technology Metals. Metallurgy Physics Solid surfaces and solid-solid interfaces Surface structure and topography Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties)
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Beschreibung
Zusammenfassung:	Sulfur atoms adsorbed on the Re(0001) surface from several different ordered structures as a function of sulfur coverage. Sudden changes in the detailed appearance of atomic-resolution STM images of these structures have been observed. Theoretical image simulations using electron scattering quantum chemical (ESQC) methods show that the image structure is strongly dependent on the chemical identity of the STM tip atom. Observed changes in the sulfur images can be caused by changes from rhenium-terminated to sulfur-terminated STM tips. These results demonstrate the value of ESQC calculations for STM image interpretation.
ISSN:	0304-3991 1879-2723
DOI:	10.1016/0304-3991(92)90312-8