This book presents a comprehensive study of important topics of Spectroscopic and Theoretical Physics for the P.G and Research Students. This book includes topics like 'Raman Spectroscopy', 'Ultraviolet - Visible Spectrometry', 'Fourier Transform Infrared Spectrometer', 'Quantum Chemical Calculations', 'Pharmaceutical Materials'. This book will benefit the Students of Physics Chemistry and Pharmacology in a coherent and lucid manner.