1. X-ray-absorption fine structure measurement with parallel-plate capacitor: Observation of surface electronic states of metals.
- Author
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Ishii, Masashi and Nakao, Aiko
- Subjects
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EXTENDED X-ray absorption fine structure , *ABSORPTION spectra , *X-ray spectroscopy , *CAPACITORS , *DIELECTRIC devices , *SCIENTIFIC apparatus & instruments , *PHYSICS - Abstract
For surface electronic state analyses of metals, we developed a new x-ray-absorption fine structure (XAFS) measurement technique with a parallel-plate capacitor. Since the capacitance is changed by x-ray-induced photoionization on the metal surface, the surface XAFS spectrum of a metal can be obtained from the capacitance dependent on the x-ray photon energy. We adopted this technique to the Cu metals. The XAFS spectrum at the Cu K absorption edge is different from the conventional XAFS spectrum of either Cu or Cu2O. This finding suggests that the XAFS spectrum indicates two-dimensional (2D) electronic states between the Cu bulk and the Cu2O native oxide layer. The 2D electronic states were characterized by degeneration of Cu 4pπ and a blueshift of Cu 4pσ. These characteristics can be explained by hybridization of vertical Cu 4pz with horizontal 4px and 4py in CuO-like structure at the interface. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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