• Recognize the fundamental principles of optical and magnetic resonance through both theory and examples drawn from molecular literature, • Derive the Fermi’s Golden Rule and simple relations between experimentally observable spectroscopic quantities and molecule dependent parameters by introducing time dependent quantum mechanics and show that spectroscopy connects matter with molecules through interaction of electromagnetic radiation. Learning Outcomes: At the end of the course, the learners should be able to: • Connect the spectroscopic line positions (frequencies), line intensities and line widths with a single approximate formula given by Enrico Fermi. • Apply principles of microwave, infrared and electronic spectroscopies to identify the fingerprint region of small molecules in gas and solution phases. • Apply the concept of chemical shift and spin-spin coupling in both NMR and EPR spectroscopy to identify high resolution spectra of small organic molecules. • Apply the concepts learnt in the course to the general study of spectra of a large class of inorganic and organic compounds given in other courses in M.Sc.