This richly illustrated book thoroughly explains the principles of diatomic and polyatomic molecules and their spectra in two distinct parts. The first part focuses on the theoretical aspects of molecular physics, covering vibration, rotation, electronic states, potential curves, and molecular spectra. It discusses various approximation methods for calculating electronic wave functions and their energies, while also introducing key terms in group theory relevant to molecular physics, facilitating an elegant description of polyatomic molecules and their symmetries. A dedicated chapter addresses molecular spectra and the dynamic processes in excited states, concluding with a discussion on Van der Waals molecules and clusters. The second part is entirely focused on experimental techniques, including laser, Fourier, NMR, and ESR spectroscopies, applicable in physics, chemistry, biology, and material science. It also explores time-resolved measurements and the effects of chemical reactions through coherent controls. A list of general textbooks and specialized literature is included for further reading. With integrated examples, definitions, and notes, this book is suitable for undergraduates and graduates in physics and chemistry who possess a foundational understanding of atomic physics and quantum mechanics.
