Calculations in spectroscopy and molecular dynamics often rely on an approximation (Born-Oppenheimer) that too often leads to unreliable results. This book addresses this deficiency by reconsidering, both analytically and numerically, the non-adiabatic coupling term and the resulting equation of motion, bringing to the reader a deeper understanding of non-adiabatic transitions in molecules. This is the first book to cover the topic in this manner.
