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, 2016
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. Deduce an expression for the spectral series of hydrogen-like atoms, taking into account the
finite mass of the nucleus. Estimate the energy required to remove the electron from singly
ionized helium atom.
2. Discuss the theory of hyperfine structure of spectral lines. What light does this throw on the
spin and magnetic moment of atomic nuclei
3. Describe the general features of the spectra of alkali-like atoms. How are they explained
4. Outline the theory of Stark effect. Show that the splitting in Stark effect increases with the
increase of principal quantum number(n).
5. What are normal and anomalous Zeeman effects Explain them theoretically.
GROUP
6. Give the complete theory of the vibrational-rotational spectrum of diatomic molecules.
7. Discuss Raman spectra of diatomic molecule and point out the similarities and differences of
this with the infra-red Raman spectra.
8. Discuss the principal features of the electronic spectrum of a diatomic molecule.
9. What do you mean by ESR Explain basic principles of interaction of electron spin and applied
magnetic field giving specific examples.
10. Discuss the intensities of rotational lines produced by a non-rigid rotator. How is Imax related
to the absolute temperature(T) of the molecule