Semiclassical Methods in Molecular Scattering and Spectroscopy ILO engineers and advanced students in 9781402047152 engineers and advanced students in the field of optical fibers The present volume begins with a short biographical sketch followed by Wigner's papers on group theory A second development has been to extend semie1assiea1 ideas to tunneling and curve crossing situations The ene10sed ~roeeedings of the NATO Advaneed Study Institute held in September 1979 are intended to provide a eomprehensive introduetion to the development of semie1assiea1 methods for mo1eeu1ar seattering and speetroseopy over the past twenty years