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- W1973978810 abstract "Adsorption structures and interaction of cyclohexane molecules on the clean and hydrogen-preadsorbed Rh(111) surfaces were investigated using scanning tunneling microscopy, spot-profile-analysis low-energy electron diffraction, temperature-programmed desorption, and infrared reflection absorption spectroscopy (IRAS). Various ordered structures of adsorbed cyclohexane were observed as a function of hydrogen and cyclohexane coverages. When the fractional coverage (θH) of preadsorbed hydrogen was below 0.8, four different commensurate or higher-order commensurate superstructures were found as a function of θH; whereas more densely packed incommensurate overlayers became dominant at higher θH. IRAS measurements showed sharp softened C–H vibrational peaks at 20 K, which originate from the electronic interaction between adsorbed cyclohexane and the Rh surface. The multiple softened C–H stretching peaks in each phase are due to the variation in the adsorption distance from the substrate. At high hydrogen coverages they became attenuated in intensity and eventually diminished at θH = 1. The gradual disappearance of the soft mode correlates well with the structural phase transition from commensurate structures to incommensurate structures with increasing hydrogen coverage. The superstructure of adsorbed cyclohexane is controlled by the delicate balance between adsorbate-adsorbate and adsorbate-substrate interactions which are affected by preadsorbed hydrogen." @default.
- W1973978810 created "2016-06-24" @default.
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- W1973978810 date "2011-12-20" @default.
- W1973978810 modified "2023-10-04" @default.
- W1973978810 title "Two-dimensional superstructures and softened C–H stretching vibrations of cyclohexane on Rh(111): Effects of preadsorbed hydrogen" @default.
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- W1973978810 doi "https://doi.org/10.1063/1.3670014" @default.
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