M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Analytical Chemistry
ANALYTICAL SPECTROSCOPY
Day Date: Saturday, 25-11-2017 Max. Marks: 70
Time: 02.30 PM to 05.00 PM
Instructions: Attempt in all five questions.
Section-I is compulsory.
Attempt any two questions from Section-II and any two questions from
Section -III.
Answer to all questions (Section II, and III should be written in one
answer book.
All question carry equal marks.
Figures to the right indicate full marks.
Use of log table and calculator is allowed.
Section I
Q.1 Answer the following. 14
What do you mean by an isomer shift?
Photoacoustic spectroscopy is comparable is
A. Phosphorescence B. NMR C. Fluorescence D. IR
Anti-Stokes lines are weaker than the Stokes lines. Give the reason.
The magnitude of the spectroscopic splitting factor depends upon
Name the source preferred in SEM technique.
The quadrupole moment arises from an (symmetrical/unsymmetrical)
distribution of electric charge in the nucleus.
What technological advances have enabled the routine use of Raman
spectroscopy?
Write the equation for recoil energy in Mossbauer spectroscopy.
What is binding energy?
Who invented photoacoustic spectroscopic technique?
Estimate the corresponding energy for a radiation having wavelength 380
nm.
If an antibonding electron is removed, the bond becomes stronger hence
becomes shorter. (True or False)
Name the factors on which the frequency of transition depend in NQR
spectroscopy.
Why the relative line width in Mossbauer spectra is very much smaller than
that found in any other spectroscopic technique?
Section II
Q.2 Describe how Raman spectroscopic technique used in molecular
structure elucidation.
07
Discuss in detail crystal field effects. 07
Q.3 Discuss general experimental setup for performing photoacoustic
spectroscopy on gas.
07
Explain with principle, the simple photoelectron spectrometer. 07
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SLR-E-51
Q.4 Explain how NQR spectroscopy is used for obtaining structural
information.
07
Illustrate the decay scheme of Co 57 in . 57Fe 07
Section III
Q.5 Write on basic principles of SPM techniques. 05
Discuss the applications of Raman spectroscopy with respect to
nanomaterials.
05
Calculate the recoil velocity and recoil energy of the free nucleus Sn 119
when emitting a gamma ray of frequency 5.76 × 1018
04
Q.6 Illustrate rotational Raman spectrum with suitable example. 05
Give an account of surface applications of photoacoustic spectroscopy. 05
Predict the ESR spectrum of radicales [CF2H] and [13CF2H] 04
Q.7 Write a notes. (Any three) 14
Resonance Raman spectroscopy.
Chemical applications of photoacuostic spectroscopy.
Atomic force microscopy cantilevers.
Factors responsible for hyperfine structure in ESR spectra.