Abstract
Abstract An expensive investigation of the XANES of palladium 3d, 2p, 2s and of rare earth 4p, 2p, 2s core levels has been carried out at the Frascati synchrotron radiation facility with the X-rays and the soft X-rays “grasshopper” beam lines. We demonstrate that we can experimentally determine, from comparison of XANES spectra of many different core levels, the 4f-5d hybridization and/or the inter-atomic 4f-ligand orbital mixing giving two different types of mixed valent systems. We have found that while in CePd 3 the 4f-5d hybridization is the dominant effect determining valence fluctuations, the inter-atomic mixing of La(4f)-Pd(4d) orbitals is present in LaPd 3 , a formal 4f 0 system.
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