## Details of CH2201 (Spring 2015)

Level: 4 |
Type: Theory |
Credits: 2.0 |

Course Code | Course Name | Instructor(s) |
---|---|---|

CH2201 |
Fundamentals of Spectroscopy |
Pradipta Purkayastha |

Syllabus |
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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. |

References |
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(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. | Programme | Semester No | Course 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 |