
B.S. MOLECULAR STRUCTURE [PHYS673] SYLLABUS

Introduction: Survery of spectra of diatomic
molecules, the hydrogen molecule ion, its doublewell potential and
important conclusions.

The Rovibrator model: Wave function and energy
states of rigid rotator, harmonic oscillator, selection rules for
transition, state population, anharmonicity of diatomic molecules,
rotating vibrator, its spectra and selection rules for transition,
intensity distribution, spectra of course and fine structure, the
symmetric top model, isotopic spectra and determination of molecular
constants.

Electronic spectra of diatomic molecules: Energy
levels, symmetry of electronic and rovibronic states, electric dipole
selection rules, FranckCondon principle, coupling of angular momenta
(Hund's coupling cases), transition between electronic states, energylevel
diagram of sigmasigma and pi pi transition.

Comparative study of Potential Energy Functions:
Comparative study of Morse, HulburtHirschfelder, Rydberg, RosenMorse,
ManningRosenNewing, PoschlTeller, Hylleraas, Kratzer, Davidson,
MeckeSutherland, Linnett, Lippencott, FrostMosulin and Rafi and
Fayyaz potential functions for diatomic molecules.

Term Manifold of Electronic States: Unites and separated
atoms approach, molecular terms from electronic configuration.

Raman Spectra: Classical theory, induced polarization
and polarizability, quantum theory of rotation and vibration Raman
effects.

Recommended Text:
1. C. C. Gerry, P. L. Knight, “Introductory Quantum
Optics”, Cambridge (2005).
2. G. Herzberg, “Spectra of Diatomic Molecules”, Van Nostrand,
1965.
3. B. H. Bransden, C. J. Joachain, “Physics of Atoms and Molecules”,
2nd ed. Pearson Education (2003).
4. K. V. Raman, R. Gopalom, P. S. Raghavan, “Molecular spectroscopy”,
Thomson Singapore (2004).
5. S. Svanberg, “Atomic and Molecular Spectroscopy”, 4th
Ed. Springer Verlag, (2001).



