The coupling of nuclear and electronic motions in molecules

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The usual quantum mechanical approach to the separation of electronic and nuclear motions is reformulated in a precise manner and re-examined. The coupling terms between the two kinds of motions prove to be rather elusive and their theoretical status often problematic. The problem areas are identified and suggestions are made about the ways in which the field might in future be developed.This Lennard-Jones memorial lecture was given on 21st September, 1992 at the Quantum Theory Conference in York.