Spectra and Energy Levels of Rare Earth Ions in Crystals

The sudden death of Gerhard Dieke at the Aberdeen Summer School on phonons in 1965 robbed the scientific world of a dedicated solid state spectroscopist. Dieke was involved in the Manhattan Project as a spectroscopist studying the uranyl salts and this led him into a detailed study of the absorption and fluorescence spectra of the rare earths which commenced in 1953 and ended with his untimely death.