Details of CH2201 (Spring 2015)

Level: 4 Type: Theory Credits: 2.0

Course CodeCourse NameInstructor(s)
CH2201 Fundamentals of Spectroscopy Pradipta Purkayastha

Introduction: Interaction of radiation with matter, Spectroscopic transition between two stationary states, Selection Rules, Absorption and emission of a photon, analogy with chemical reaction, and different areas of spectroscopy.
Rotational spectroscopy: Diatomic molecules, rigid rotor approximation, energy levels, selection rules, rotational lines with a constant gap and determination of bond length, population of energy levels and intensity of spectral lines, isotope effect, non-rigid rotor, energy levels and spectroscopic consequences, classification of polyatomic molecules, different top categories.
Vibrational spectroscopy: Diatomic molecules, Harmonic oscillator (Hookes approximation), energy levels and wave functions for a Schrdinger oscillator, selection rules, population of energy levels, potential energy curves, Morse potential, energy levels, selection rules, existence of overtones and hot bands, vibration-rotation spectrum, rigid rotor-anharmonic oscillator model, energy expressions, selection rules, P,Q,R branches, Born-Oppenheimer approximation and its breakdown, Polyatomic molecules and normal modes of vibration, applications of vibrational spectroscopy.
Raman spectroscopy: Histroical background, Rayleigh and Raman scattering, Stokes and anti-Stokes lines, classical theory of Rayleigh and Raman scattering, selection rules, rotational and vibrational Raman effect, mutual exclusion principle, applications of Raman spectroscopy.
Electronic spectroscopy: Principal quantum number and energy levels, singlet and triplet states, Franck-Condon principle, spectroscopic determination of dissociation energy, decay of an electronically excited state, photophysical processes, Jablonsky diagram, fluorescence and phosphorescence, excited state lifetime and quantum yield.
Photoelectron spectroscopy: Elementary idea about ultraviolet photoelectron spectroscopy (UPS) and x-ray photoelectron spectroscopy (XPS), application to chemistry.
Nuclear Magnetic Resonance (NMR) and Electron Spin Resonance (ESR) spectroscopy: Nuclear and electron spin, Stern-Gerlach experiment, magnetic moment, g-factor, energy in a magnetic field, precessional frequency, Bohr magneton, ESR transition, selection rules, hyperfine structure, examples, nuclear magneton, nuclear g-factor, NMR transition, selection rules, shielding constant and chemical shift, examples.

(1) C.N. Banwell and E.M. McCash, Fundamentals of Molecular Spectroscopy, Tata-McGraw Hill, New Delhi.
(2) P. Atkins and J. dePaula, Physical Chemistry, Oxford University Press, Oxford.
(3) T. Engel and P. Reid, Physical Chemistry, Pearson Education.

Course Credit Options

Sl. No.ProgrammeSemester NoCourse Choice
1 IP 2 Not Allowed
2 IP 4 Not Allowed
3 MR 2 Not Allowed
4 MR 4 Not Allowed
5 MS 4 Core
6 RS 1 Not Allowed
7 RS 2 Not Allowed