Page 30 - CatalogNEP-PS

15. Schaum's Outline of College Physics, by E. Hecht, 11th edition, McGraw Hill, 2009.
16. Modern Physics by K Sivaprasath and R Murugeshan, S Chand Publication, 2010.
17. Nuclear Physics "Problem-based Approach" Including MATLAB by Hari M. Aggarwal,
PHI Learning Pvt. Ltd. (2016).

DISCIPLINE SPECIFIC ELECTIVES:

Phys.212 Atomic and Molecular Physics 3+1*

LEARNING OBJECTIVES:

The primary objective of this course is to:
 Understandthe hydrogen and alkali spectra, coupling schemes, atoms in magnetic fields.
 Learn Infrared and Raman spectroscopy, and electron spectra.
 Know about line broadening mechanisms and Lasers.

LEARNING OUTCOMES:

On successful completion of the module, students should be able to:
 describe the atomic spectra of one and two valance electron atoms.
 Study the Bohr Atom model in detail and understand about atomic excitations
 explain the change in behaviour of atoms in external applied electric and magnetic field.
 explain rotational, vibrational, electronic and Raman spectra of molecules.
 Describe electron spin and nuclear magnetic resonance spectroscopy and their
applications.

THEORY (45 Hours)

UNIT 1 (15 Hours)

Hydrogen and Alkai Spectra: Series in hydrogen, nuclear mass effect, elliptical orbits,
Sommerfeld model, spin-orbit coupling, relativistic correction and Lamb shift (qualitative). Alkali
Spectra and intensity ratios in doublets
Complex Spectra: LS-Coupling scheme, normal triplets, basic assumptions of the
theory,identification of terms, selection rules, jj- coupling, Lande‘s interval rule, Selection rules,
intensity ratios, regularities in complex spectra. Normal and anomalous Zeeman and Paschen
Back effects, intensity rules.

UNIT 2 (15 Hours)
Infrared and Raman Spectra: Rigid rotator, energy levels, spectrum, intensity of rotational lines,
Harmonic oscillator: energy levels, eigenfunctions, spectrum, Raman effect, Quantum theory of
Raman effect, Rotational and Vibrational Raman spectrum. Anharmonic oscillator: energy levels,
Infrared and Raman Spectrum, Vibrational frequency and force constants, Dissociation of
molecules.
Non-rigid rotator including symmetric top: energy levels, spectrum, Vibrating-rotator energy
levels, Infrared and Raman spectrum, Symmetry properties of rotational levels, influence of
nuclear spin, isotope effect on rotational spectra.
Electronic Spectra: Classification of electronic states: Orbital angular momentum, Electronic
energy and potential curves, resolution of total energy, Vibrational Structure of Electronic
transitions.

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