Course

UNIT 1:Atomic Physics: Dipole selection rules examples, Natural and Doppler Broadening, Spin-orbit coupling, Lamb shift and Rutherford experiment,UNIT 2:Hyperfine structure: Hyperfine structure of lines, Normal and specific mass shifts, Anomalous Zeeman effect, Paschen-Back and Stark Effects, Quantum defect.UNIT 3:Molecular Physics: Rotational Spectra: Transition probabilities, selection rules. Rotational spectra of diatomic molecule- rigid and non-rigid rotator models. The Franck Condon principle. Dissociation energy. A brief discussion of Intensity alternation and missing lines in rotational spectra.UNIT 4:Vibrational spectra: Vibrational spectra of a diatomic molecule – harmonic and anharmonic oscillator models. Normal modes of vibration and their distribution into symmetry species of the molecule, Overtone and Combination Bands, Vibrational Potentials, Infrared and Raman Selection rules. Vibration-Rotation Energy Levels and Spectra: Spectra of rotational vibrational levels, Rotational Raman and IR Spectra of linear molecules and Determination oftheir Geometry. Rotation-Vibration Band of a Diatomic Molecule and polyatomic molecules. Vibrational structure of electronic transitionUNIT 5:Resonance Spectroscopy: ESR and NMR. Lande g factor, Splitting of degenerate states. Precession and spectra, selection rules, fine structure, Resonance spectra of some organic molecules.

Course Objectives:This course provides a fundamental understanding of atomic and molecular physics such as selection rules, spin-orbit coupling, hyperfine structure, rotational and vibrational spectra, and resonance spectroscopy.Course Outcomes:CO1: Explain the spectroscopic selection rules, fine and hyperfine transitions in atomic spectra CO2: Examine rotational and vibrational spectra of diatomic and polyatomic molecules usingrigid/non-rigid rotator and oscillator models.CO3: Analyze vibrational and rotational energy levels in IR and Raman spectroscopy for molecular structure determination.CO4: Explain the principles of ESR and NMR, including Lande g-factor and fine structures

TEXT/REFERENCE BOOKS:1. B.H. Bransden and C.J. Joachain, Physics of Atoms and Molecules, Pearson 2nd edition, 2003.2.H.E. White, Introduction to Atomic Spectra, McGraw-Hill Education, 1963.3.H.G. Kuhn, Introduction to Atomic Spectra, Prentice Hall Press; 2nd edition, 1970.4.N Zettili, Quantum Mechanics Concepts and Applications, John Wiley & Sons, 2nd Ed, 2009.5.J J Sakurai, Modern Quantum Mechanics, Pearson, 2nd Ed, 2016.