Optical absorption spectroscopy in geosciences: Part II: Quantitative aspects of crystal fields

摘要: In Part I (Chapter 3 in this volume–Wilder et al., 2004) we described the basic principles of crystal field theory (CFT) based on group theory and symmetry. The usefulness of CFT resides in the fact that it can predict the type and number of electronic transitions and their relative energies for transition metal ions in crystals. Hence CFT enables interpretation of the optical absorption spectra. The crystal (or ligand) field induced on the central ion depends on the type and positions of the ligands (ie, bond angles and distances R) and on the point …