M.Sc. (Semester III) (CBCS) Examination Mar/Apr-2018
Analytical Chemistry
ANALYTICAL SPECTROSCOPY
Time:2½ Hours
Max. Marks: 70
Instructions: Attempt in all 5 questions. Section I is compulsory. Attempt any two questions from Section II and any two from Section III Answers to all questions (Section II and III) should be written in the one answer book. All questions 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
Give the statement for Doppler effect.
If a non bonding electron is removed, there is virtually no change in bond length or bond strength [True/False]
How the energy of the electromagnetic radiation relates with wavelength and frequency?
What do you mean by the term binding energy?
What is the basis of photo acoustic spectroscopy?
Electron-nucleus coupling constants are very much bigger than those for nucleus-nucleus coupling constants [True/False]
Define isomer shift.
Mention different probes preferred in scanning probe microscopy.
Give the selection rule for pure rotational Raman spectra.
What is polarizability?
Write theoretical value of Linde's splitting factor for an electron.
For NQR spectra the sample should be in
How many peaks you expect for methyl radical in ESR spectrum?
Define Rayleigh scattering.
SECTION II
Q.2
Outline the decay process of 57Co in 57Fe.
07
Discuss the surface applications of photoacoustic spectroscopy.
07
Q.3
Explain the use of chemical isomer shift in understanding molecular structure.
07
Illustrate the quantum mechanical approach of Raman spectroscopy.
07
Q.4
Explain with principle the ESR spectrometer.
07
What do you understand by NQR group frequencies? Explain its use in molecular structure determination.
07
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SLR-UF-235
SECTION III
Q.5
Explain with theory XPES and UPES.
05
Write on PAS gases.
05
Electron spin resonance is observed in atomic hydrogen at a magnetic field B=0.34T. Calculate value for an electron in the hydrogen atom, if operating frequency is 9.5 GHz.
04
Q.6
Explain the energy levels and transitions for the nucleus having spin I 3/2.
05
Discuss various applications of Scanning Tunneling Microscopy (STM).
05
Illustrate pure rotational Raman spectrum.
04
Q.7
Write notes on any three of the following:-
14
Photoelectron spectrometer
Atomic force microscopy
Raman spectrometer
Applications of Resonance Raman spectroscopy