Open AccessSmall hydrocarbons on metal surfaces: adsorption‐induced changes in electronic and geometric structure as seen by X‐ray absorption spectroscopy
Author(s) -
Wöll Christof
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500019877
Subject(s) - x ray absorption spectroscopy , chemistry , monolayer , absorption spectroscopy , molecule , absorption (acoustics) , x ray absorption fine structure , spectroscopy , metal , photochemistry , analytical chemistry (journal) , intramolecular force , materials science , organic chemistry , biochemistry , physics , quantum mechanics , composite material
Monolayers of several unsaturated and saturated hydrocarbons (ethylene, acetylene, benzene, n ‐hexane, cyclohexane, n ‐octane, n ‐hexatriacontane) adsorbed on a number of different metal surfaces [Cu(111), Au(111), Ru(0001) and Pt(111)] have been investigated by carbon K ‐edge X‐ray absorption spectroscopy (XAS). Whereas the corresponding multilayer data qualitatively resemble the core‐excitation spectra observed for the free molecules, generally significant modifications are observed in the monolayer data. For the saturated hydrocarbons, a strong quenching of the Rydberg R resonance at 287.7 eV and the appearance of a new broad feature at around 285.1 eV ( M resonance) is observed for molecules in direct contact with the metal surfaces. In the case of the unsaturated hydrocarbons, for a number of metals, distinct new features are seen in the XAS data, revealing significant intramolecular distortions.