Vibronic Interactions In Molecules And Crystals

The theory of vibronic interactions is a new field of investigation in the physics and chemistry of molecules and crystals that goes beyond the separate descriptions of the motion of electrons and nuclei in the adiabatic approximation. A systematic treatment of the most important manifestations of nonadiabaticity (the Jahn-Teller, pseudo-Jahn-Teller and Renner effects) is given, including derivation of the vibronic Hamiltonian, proof of the Jahn-Teller theorem, determination of the adiabatic potentials of electronically degenerate and pseudodegenerate polyatomic systems, calculations of vibronic energy spectra and solutions of the multimode and multicenter problems. The second part of the book contains applications of the theory to optical and infrared spectroscopy, EPR and cooperative phenomena in crystals.