Charge transfer Charge transfer interaction Chemical shift Conjugative effect Dielectric materials Electrodes Electronic origin Energy dispersive spectroscopy Física Hyperconjugative interactions Intramolecular interactions Ion exchange Magnetic shielding constant Model system Molybdenum alloys Mössbauer spectroscopy Optical metallography Qualitative approach Qualitative study Scanning electron microscopy Second orders Solidification Spark-erosion Substituent effect Sulfur compounds Uranium alloys Uranium dioxide Virtual excitations X ray diffraction analysis X-ray diffraction