Designed as a textbook for undergraduate and postgraduate students of chemistry and physics, Atomic and Molecular Spectroscopy elucidates the basic principles and applications of spectroscopy. The physical and quantitative aspects of spectroscopic techniques are covered comprehensively in one book. Simple mathematical concepts are used to explain the important role that mathematics plays in the development of the subject. Elementary quantum mechanical principles are introduced to relate the characteristic chemical behaviour of atoms and molecules such as vector representation of momentum and vector coupling approximation to spectra.