Scanning tunneling microscopy study of benzene adsorption on Si(100)-(2×1)

Autor:	K. W. Self, W.H. Weinberg, R. I. Pelzel, J. H. G. Owen, C. Yan, W. Widdra
Rok vydání:	1998
Předmět:	Dimer Dangling bond Surfaces and Interfaces Condensed Matter Physics Photochemistry Surfaces Coatings and Films law.invention Crystallography chemistry.chemical_compound chemistry law Monolayer Molecule Scanning tunneling microscope Benzene HOMO/LUMO Surface states
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 16:1031-1036
ISSN:	1520-8559 0734-2101
DOI:	10.1116/1.581227
Popis:	Scanning tunneling microscopy (STM) has been used to investigate the adsorption of benzene on nominally flat Si(100)-(2×1) substrates. STM images show that benzene adsorbs on top of the dimer rows bonding to the two Si–Si dimer dangling bonds. Bias-dependent imaging indicates that the highest occupied molecular orbital of adsorbed benzene lies approximately 1.2 eV below the top of the valence band and that the lowest unoccupied molecular orbital is at least 3.5 eV above the highest occupied molecular orbital. At higher coverages, the benzene molecules are adsorbed on every other dimer along the dimer row and on every other dimer across the dimer rows resulting in a local c(4×2) periodicity, in agreement with the saturation coverage of ∼0.25 monolayer.
Databáze:	OpenAIRE
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