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Articles you may be interested inCombined UHV/high-pressure catalysis setup for depth-resolved near-surface spectroscopic characterization and catalytic testing of model catalysts Rev. Sci. Instrum. 85, 055104 (2014); 10.1063/1.4874002 Methane combustion on Pd-based model catalysts: Structure sensitive or insensitive?Reaction kinetics on supported model catalysts: Molecular beam/in situ time-resolved infrared reflection absorption spectroscopy study of the CO oxidation on alumina supported Pd particles

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We have investigated self-assembled stearic acid films adsorbed on an Al 2 O 3 film by means of electron paramagnetic resonance (EPR) as well as near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The stearic acid molecules are orientated in the film as shown by the NEXAFS data. Doping of the film with spin-labels in order to make the films accessible to EPR spectroscopy distorts the structure only slightly as long as the concentration of the spin-labels is low. The temperature-dependent EPR spectra reveal a distinct dependence of the onset of the rotational motion of the spin-label with variation of the location of the spin-label along the chain. The analysis of the EPR line shape allows to gain insight into the internal motion of the molecular chain.

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