Course Title: 
Atomic and Molecular Physics
Course Code: 
Year Taught: 
Integrated Degree
School of Arts and Sciences

'Atomic and Molecular Physics' is a course offered in Sixth Semester of B. Sc. - B. Ed. in Physics, Mathematics, Computer Science program at the School of Arts and Sciences, Amrita Vishwa Vidyapeetham, Mysuru campus.

To enable students to apply the basic knowledge of classical and quantum mechanics at the atomic and molecular level.

Unit I: 

X-Rays: Continuous X-ray spectra. Duanne and Hunt limit. Characteristic X ray spectra, Moseley’s law and its significance, X-ray energy levels.
Bragg’s law and Bragg spectrometer. A brief mention of different types of crystals. Structures of NaCl and KCl crystals.
Compton Effect – Expression for Compton Shift.

Unit II:

Atomic Spectra:

The Electron: Determination of e/m of an electron by Thomson method, Determination of charge of an electron by Millikan’s oil drop method.
Atomic Spectra: Inadequacy of Bohr atomic model, correction due to finite mass of the nucleus, Rydberg constant in terms of reduced mass, Excitation and Ionisation potentials, Franck-Hertz experiment, Bohr-Sommerfeld Model of atom, vector model of an atom, Electron spin, space quantisation, magnetic moment of an electron due to its orbital motion. Stern-Gerlach experiment and its theory.
Spin-orbit interaction and Fine structure of spectral lines.Quantum numbers and selection rules.Pauli’s exclusion principle.Electronic configuration of atoms.Valence electron and a brief mention of L-S and J-J coupling for trio electron atoms.

Unit III:

Zeeman effect: Introduction, experimental study of normal Zeeman effect, theory of normal Zeeman effect, expression for Zeeman effect, quantum theory of normal Zeeman effect, anomalous Zeeman effect, Paschen-Back effect and Stark effect.

Unit IV:

Molecular Spectra: Molecular formation, the H molecular ion, H2 – molecule. Salient features of molecular spectra.
Rotation, vibration and electronic spectra of molecules, associated quantum numbers and selection rules.Theory of pure rotation and rotation- vibration spectra, Raman and IR spectra, simple applications.

Unit V:

Electromagnetic Theory And Maxwell’s Equations: Displacement current, Setting up of Maxwell’s equations in SI units, Hertz experiment, Travelling electromagnetic wave, Wave equations (qualitative and quantitative) – Energy transport and Poynting vector, Poynting theorem. A radiation pressure (Normal and Oblique incidence). Concept of electric dipole, magnetic dipole, expression for energy radiated by a dipole (No derivation).

  1. Atomic and nuclear physics -Littlefield and T.V. Thorley.
  2. Molecular spectra – G Herzberg. 
  3. Fundamental university physics, vol. 3 – Aloson and Finn.
  1. Perspectives of Modern Physics Beiser.
  2. Electromagnetism, Reitz and Milford.
  3. Concepts of modern physics, Fifth Edition- ABeiser.
  4. Introduction to modern Physics- F.R. Richtmeyer. E.H. Kennard and T. Lauritsen. 
  5. Lasers – A K Gatak. 
  6. Modern Physics - K.S. Krane. 
  7. Introduction to modern Physics – H S Mani and G K Mehta.