Electron energy loss spectroscopy of the vibration modes of water on Ag(100) and Ag(115) surfaces and comparison to Au(100), Au(111) and Au(115)
作者： Harald Ibach
DOI: 10.1016/J.SUSC.2012.05.024
关键词: Hydrogen 、 Spectral line 、 Adsorption 、 Electron energy loss spectroscopy 、 Crystallite 、 Molecule 、 Infrared 、 Analytical chemistry 、 Chemistry 、 Electrode
摘要: Abstract Motivated by rather similar behavior of the Helmholtz capacitances stepped Au(11 n ) and Ag(11n) electrodes we have extended a previous study on vibration spectrum water adsorbed at low temperatures gold surfaces to Ag(100), Ag(11 5 Au(111) surfaces. On Ag(100) surfaces, spectra show presence typical H-bonded network molecules. The weak intensity, absence non-hydrogen bonded hydrogen atoms, similarity infrared ice crystallites, increase in angular spread elastic peak are indicative adsorption form three-dimensional clusters. This is stark contrast Au(100) where match model involving stacks bilayers. coverage Ag(115) resemble results Au(115): A considerable fraction H-atoms remains non-H-bonded state spectral features step-sites identified. first layer should therefore structure as recently proposed theoretical concerning Au(115). For larger doses, experimental suggests formation contrary Au(115) layered with constant non-hydrogen-bonded persists higher doses.
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