N A L A N D A O P E N U N I V E R S I T Y
M.Sc. Physics, Part-I
PAPER-VI
(Atomic and Molecular Physics)
Annual Examination, 2017
Time 3 Hours. Full Marks 80
Answer Five Questions in all, selecting at least Two Questions from each group.
All questions carry equal marks.
GROUP
1. Describe and explain the different types of coupling of vector atomic models. Give their
respective merits.
2. Write down the Schrödinger equation of one electron atom and solve it by the method of
separation of variables. Explain the physical meaning of the different quantum numbers that
come out in the solution.
3. State and explain Pauli's exclusion principle and discuss how this principle is connected with
the symmetry of the wave function.
4. How does the nuclear spin affect the hyperfine structure of the emission spectra of atoms.
5. Discuss briefly the various factors which contribute to the broadening of spectral line.
GROUP
6. Describe the principal feature of the rotational bond spectrum of a diatomic molecule.
Estimate the energy difference between the rotational levels J 0 and J 1 of Hcl molecule.
Its moment of inertia is 2.66 × 10-47 kg.m².
7. State Franc-Condon principle and give its wave mechanical interpretation. How does it help in
understanding the intensity distribution in the vibrational structure of the electronic transitions
of a diatomic molecule.
8. Discuss the principal features of the electronic spectrum of a diatomic molecule.
9. What do you mean by ESR Explain the basic principles of interaction of electrons spin and
applied magnetic field.
10. Write notes on any Two of the following
LS and JJ Coupling.
NMR spectroscopy.
Spin-spin coupling between two or more nuclei.
Raman spectra of diatomic molecules.