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The high temperature superconductor YBa 2 Cu 3 O 7  is characterized by a very anisotropic structure. The electronic structure of this compound is studied using high resolution valence band spectroscopy within an electron probe microanalyzer. From single crystals and melt-textured specimens,orientation dependent Cu-L α  spectra are obtained using a beryl crystal. The Cu-L α  spectra with polarization parallel to the z-direction show a larger energetic breadth compared to those obtained with polarization perpendicular to z. This is caused by occupied Cu3d 3z  2 - r  2  like states, as could be shown by other workers using cluster calculations.

Polarized Oxygen K α and Copper L α X-Ray Emission Spectroscopy of YBa 2 Cu 3 O 7