The geometrical and chemical properties of platinum-ruthenium bimetallic surfaces have been investigated with infrared spectroscopy and thermal desorption spectroscopy. For this purpose well defined amounts of platinum have been deposited onto the (001) surface of a ruthenium single crystal under ultra high vacuum conditions. Interestingly platinum is growing pseudomorph on Ru(001), it keeps the by 2.5% reduced lattice constant of the Ru substrate up to the tenth monolayer. The function of the chemical reactivity with increasing layer thickness has been characterised using the probe molecules carbonmonoxide and oxygen. The local binding geometries of carbon monoxide were established by a quantitative measurement of the vibration frequencies. For oxygen there were one physisorbed and many chemisorbed states were identified. The most prominent changes were the binding energy of carbon monoxide and the sticking coefficient of oxygen.
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The geometrical and chemical properties of platinum-ruthenium bimetallic surfaces have been investigated with infrared spectroscopy and thermal desorption spectroscopy. For this purpose well defined amounts of platinum have been deposited onto the (001) surface of a ruthenium single crystal under ultra high vacuum conditions. Interestingly platinum is growing pseudomorph on Ru(001), it keeps the by 2.5% reduced lattice constant of the Ru substrate up to the tenth monolayer. The function of the c...
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