Explain the various spectral series observed in the spectrum of hydrogen atom.

Write down the spectral designations of the terms of the hydrogen atom whose electrons is in the state with principal quantum number n = 3.

Explain what is meant by L-S and j-j coupling in atoms having more than one electron.

Write down the expression for the energy levels of alkali atoms.

What is a Molecule ? How can molecules be classified ?

Explain the difference between symmetric top and asymmetric top molecules.

The ground state vibrational energy of hydrogen molecule is 0.0273 eV. Find the force constant of the molecule.

Explain the variation of intensity of infrared bands.

In the rotational Raman spectrum of HCl, the displacements from the exciting line are given by Δν = ±(62.4, 41.61) cm^-1. Calculate the moment of inertia of the molecule.

Describe and explain the main features of Rotational Raman Scattering.

Discuss L-S coupling scheme for a two valence electron system and find the expression for the interaction energy.

Explain Thomas-Fermi statistical model for the electronic structure.

Explain rotational spectrum of a rigid diatomic molecules.

Explain microwave spectrum of a non-rigid rotator of diatomic molecule.

Discuss the limitations of spectra of a diatomic molecule as an harmonic oscillator and explain those with Morse potential energy curve.

How does a diatomic molecule as rotating-vibrator explain the main features of near infrared absorption spectrum ? Why is infrared spectrum not obtained for homonuclear diatomic molecule ?

Describe and explain the main-features of :

(a) Vibrational Raman Scattering

(b) Rotational Raman Scattering

(c) Vibrational-Rotational Raman Scattering.

Explain principle of Mossbauer effect and its applications.

Write short notes on any two of the following :

(a) Thomas Fermi Statistical Model

(b) Morse Potential Energy Curve

(c) Photo electron spectroscopy

(d) IR spectrometer.