21PHY316 ATOMIC AND MOLECULAR PHYSICS PHYSICS PAPER -VII-

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 Ionization potentials, Franck-Hertz experiment, Bohr-Sommerfeld Model of atom, vector model of an atom, Electron spin, space quantization, 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 (10 hrs): 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-

NMR Spectroscopy: Introduction to NMR spectroscopy, Chemical shifts and J-coupling One-dimensional proton NMR One dimensional NMR of X-nuclei (13C, 15N, 31P and 19F) Homonuclear 2D NMR Heteronuclear 2D NMR Structure determination of molecules Mapping of CO’s and PO’s

TEXTBOOKS:

  1. Atomic and nuclear physics -Littlefield and T.V. Thorley
  2. Molecular spectra – G Herzberg
  3. Fundamental university physics, vol. 3 – Aloson and Finn

REFERENCES:

  1. Perspectives of Modern Physics Beiser.
  2. Concepts of modern physics, Fifth Edition- ABeiser
  3. Introduction to modern Physics- F.R. Richtmeyer. E.H. Kennard and T. Lauritsen
  4. Lasers – A K Gatak
  5. Modern Physics – K.S. Krane
  6. Introduction to modern Physics – H S Mani and G K Mehta