Details of CH2201 (Spring 2020)

Level: 2 Type: Theory Credits: 2.0

Course CodeCourse NameInstructor(s)
CH2201 Fundamentals of Spectroscopy Ratheesh K Vijayaraghavan

1. Introduction: Interaction of radiation with matter, Spectroscopic transition between two
stationary states, Transition probability and Selection Rules, Absorption and emission of
a photon, Einstein A and B coefficients, Line shape functions, Spectral broadening
mechanisms (homogeneous, inhomogeneous, collision, thermal, Doppler, solvation,
instrumental -qualitative treatment), Fourier Transform, spectral resolution. (5 lectures)
2. 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. (4 lectures)
3. 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. (5 lectures)
4. Raman spectroscopy: Historical background, Rayleigh and Raman scattering, Stokes
and anti-Stokes lines, applications of Raman spectroscopy. (1 lecture)
5. Electronic spectroscopy: Principal quantum number and energy levels, spin-orbit
coupling, 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. (8 lectures)
6. Photoelectron spectroscopy: Basics about ultraviolet photoelectron spectroscopy (UPS)
and x-ray photoelectron spectroscopy (XPS), application to chemistry. (2 lectures)

1. Basic molecular spectroscopy, P.A. Gorry, Butterworth & Co. (Publishers) Ltd 1985.
2. Quantum chemistry and spectroscopy (3rd Ed), Thomas Engel, Warrem Hehre, Pearson
(Publishers), ISBN-13: 978-0321766199.
3. P. W. Atkins and J. de Paula, Physical Chemistry, Oxford University Press, Oxford.
4. C.N. Banwell and E.M. McCash, Fundamentals of Molecular Spectroscopy, TataMcGraw
Hill, New Delhi.
5. Spectra of atoms and molecules, Peter. F. Bernath, Oxford Univ. Press, Oxford.

Course Credit Options

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