Atomic and Molecular Spectroscopy, PHYS 9112

Optical spectra of one electron systems, Semi-classical and Quantum mechanical treatment of one electron atoms, Radial wave functions and radial distribution functions in different quantum states, Energy corrections: relativistic correction, spin orbit interaction, Darwin correction and Fine structure, Zeeman Effect. Interaction with external fields, Field ionization, Lamb shift, Two electron atoms, Quantum mechanical treatment of two electron atoms, Level structure, Angular momentum coupling schemes (LS, LK, jK, jj), Doubly excited states of two electron atoms, Inner shell excitation, Relative intensities, life time and line profile of spectral lines. Laser Spectroscopy, one photon absorption and emission, Multiple transitions, Two photon absorption and emission, Selection rules, Spectra of alkalis and Hydrogen like atoms, Hyperfine structure and isotope shift, Diatomic and polyatomic molecules, Molecular orbitals, molecular structure and molecular energy levels. Quantum mechenical treatment for a rigid rotor and non rigid rotor. Spectra of Di-atomic Molecule.

Learning outcomes:s:

After completion of the course, students will be able

1. To describe the atomic spectra of one and two valance electron atoms, on the basis of classical and quantum mechanical treatment.

2. To write the energies and wave functions of different energy states of the various elements.

3. Explain the change in behavior of atoms in external magnetic field.

4. Using different coupling schemes, to write the configuration and term values of energy states.

5. Line profile and different line broadening mechanisms.

6. To understand the concept of molecular orbitals, molecular energy levels and molecular structure.

Recommended Books:

1- Atoms, molecules and Photons by W. Demtroder, Springer-Verlag Berlin 2006.

2- Atomic Physics by C. J. Foot, Oxford University Press, 2005.

3- Physics of atoms and molecules by B H Bransden and C J Joachain John Willay & Sons New York, 1997.