Abstract
This chapter examines relativity, electronic spectroscopy, and magnetism. Relativity is most commonly associated with the world of the very large. It is less well known, however, that relativity also has a significant impact at the atomic level. In particular, the chemical consequences of relativity are very significant for heavy elements such as the actinides. These consequences may be divided into two main areas: the modification of atomic orbital energies and the effects of spin-orbiting coupling. The chapter then looks at electronic absorption spectroscopy, which is the study of photon/matter interactions, and has been extensively used to investigate f element compounds. It also considers the use of lanthanide ions in colour television sets, as well as neodymium lasers. Finally, the chapter studies the magnetic behaviour of Ln3+ and the magnetic properties of actinide compounds.
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