Spectroscopy is an indispensable tool in understanding physical and chemical structure, and today verysophisticated spectroscopic instruments are available with modern data processing techniques. This bookcovers the elementary and basic aspects of atomic spectroscopy like Bohr's theory and atomic physics up to thelatest developments including laser cooling, Bose-Einstein condensates and atom lasers. Spectroscopy playsa major role in every field of science and this book would be valuable for phys