This book originated out of a desire to have the vibrational absorption, Raman scattering, vibrational circular dichroism and Raman optical activity combined in one source. The younger generation students practicing vibrational spectroscopy would undoubtedly come across these different areas and would benefit from having these topics covered in a unified manner. Some of the material presented in this book, especially portions of Chapters 2-4, has been taught as a part of Molecular Spectroscopy and Quantum Chemistry courses for graduate students. The topics covered are generally of an advanced level, so this book would be appropriate for graduate students and practicing scientists in vibrational spectroscopy.