DISTANCE EDUCATION
M.Sc. (Physics) DEGREE EXAMINATION, MAY 2017.
SPECTROSCOPY
(2008 onwards)
Time Three hours Maximum 100 marks
Answer any FIVE questions.
Each question carries 20 marks.
20 100)
1. Discuss Valence bond theory.
What is hybridization? Explain ammonia in terms
of SP3 hybrid orbitals.
Explain the Heitler London theory for hydrogen
molecule and discuss the exchange degeneracy.
2. Describe the classification of molecules.
Explain the rotational energy levels for different
vibrational states of a diatomic molecules and
illustrate the spectrum of carbon monoxide.
Discuss the isotopic effect in rotational spectra of
diatomic molecules.
3. Explain the theory of Vibrating diatomic molecule.

Discuss rotational spectrum of symmetric Top
molecules. Show how bond lengths of symmetric Top
molecules could be deduced.
Write a note on portrait parabolae.
Sub. Code
21
DE-654
2
SER
4. State and explain Franck Condon principle. Give
its importance.
Explain the theory of rotation Vibration spectra of
polyatomic molecules.
Write a note on pre dissociation.
5. What is inverse Raman effect? Discuss the use in
inorganic liquids.
Explain Hyper Raman effect using classical
treatment.
Write a note on two photon absorption.
6. Describe the photo acoustic Raman Scattering.
Explain the instrumentation details and the
experimental technique of Raman spectroscopy.
Explain about spin-lattice interaction.
7. Describe the theory of NMR spectroscopy.
Explain the principles and applications of NQR.
Write the applications of Mossbaure spectroscopy.(6)
8. Explain about the dipole-dipole interaction.
Explain the ESR spectrum of Hydrogen atom.
Write a brief note on crystal symmetry and
molecular structure.