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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034 M.Sc. DEGREE EXAMINATION – PHYSICS FOURTH SEMESTER – April 2009 PH 4805 - SPECTROSCOPY Date & Time: 21/04/2009 / 9:00 - 12:00 Dept. No. XC 44 Max. : 100 Marks PART A Answer all questions 10 X 2 = 20 1. Explain Born-Oppenheimer approximation. 2. What is Raman effect? 3. What are the normal modes of vibration for ethane and methane ? 4. Why antistokes lines are less intense than stokes lines? 5. Explain, the symmetric top molecules with an example. 6. Express 30 keV in terms of joules. 7. What is Fortrat parabola? 8. Predict the NMR signals for CH3COOH AND CH3-CH2-Br 9. What is quadrupole effect? 10. Mention any two general techniques for studying the surfaces? PART B Answer any four questions 4 X 7.5 = 30 11. Derive an expression for the moment of inertia about the axis of OCS molecule. Explain the isotopic substitution method to estimate bond length? 12 a. Mention in few lines, the best way of studying H2 molecule by spectroscopic technique? 12 b. Explain the theory of pure rotational Raman spectra of a linear molecule (2+ 5.5) 13 Write a note on Dissociation and energy and dissociation products. Show that γ max = (1/2xe )-1, where xe is anhormonicity constant 14 What is T1 and T2 relaxation time? Show that T1 = 1/2. 15 A particular Mossbauer nucleus has spins 5/2 and 3/2 in its excited and ground states. Into how many lines will the ray spectrum split if a) the nucleus is under the influence of an external magnetic field b) both internal electric field gradient and external field is present. PART C Answer any four (4 X 12.5 = 50) 16 a. Explain, with theory the spectrum of a linear diatomic molecule of rigid rotor type. Outline the correction for non-rigid type. (10.5) 16 b. The rotational constant of NO is 1.7201 cm-1. Calculate the moment of inertia of the molecule about a line perpendicular to its axis. (2) 17 a. Outline briefly each section of an IR spectrometer. 17.b. The fundamental and first overtone transition of 14N 16O are centered at 1876.06 cm-1 and 3724.20 cm-1 respectively. Evaluate the equilibrium vibration frequency, the anharmonicity constant, Zero point energy and force constant of the molecule (4.5+ 8) 18. Explain in detail the Chemical analysis by Electronic Spectroscopy and how it is useful to characterize the samples. 19. Explain in detail, the priniciples involved in NMR instrumentation. 20. Explain the functioning of EELS. ----end----