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X-ray absorption spectroscopy of single-crystalline „ VO … 2P2O7: Electronic structure and possible exchange paths S. Gerhold, N. Nu¨cker, C. A. Kuntscher,* and S. Schuppler Forschungszentrum Karlsruhe, IFP, P.O. Box 3640, D-76021 Karlsruhe, Germany Naval Research Laboratory, Code 6345, Washington DC 20375 A. V. Prokofiev,† F. Bu¨llesfeld, and W. Assmus Kristall- und Material