Interaction of Radiation with Ions in Solids
This series of five lectures presents in a fundamental and comprehensive way the interaction of radiation with ionic systems in solids. The first lecture deals with the quantum theory of solids; the adiabatic (Born-Oppenheimer) approximation is introduced and its implications for the use of the symmetry properties of the system are treated. The second lecture deals with the quantum theory of the radiation field; this theory is arrived at starting from a classical description of such a field. The third lecture deals with the interaction of a radiation field and a charged particle and treats the various radiative processes that such an interaction can produce. The fourth lecture deals with the basic processes of absorption, induced emission and spontaneous emission; in particular, the connections between the phenomenon of spontaneous emission and the “Fluctuation-Dissipation Theorem” of Statistical Mechanics are examined. Finally the fifth lecture deals with the radiative processes of ions in solids. After a quick review of the theory of lattice vibrations, the Franck-Condon principle in its various formulations (classical, semi-classical and quantum-mechanical) is introduced. This principle is then generalized and applied to ionic systems in solids; the effects of the lattice vibrations on the spectra of solids are also examined.
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