M.Sc. (Semester II) (CBCS) Examination Nov/Dec-2018
Physics (Materials Science)
ANALYTICAL TECHNIQUES
Time: 2½ Hours Max. Marks: 70
Instructions: Q 1 and Q 2 are compulsory.
Attempt any three questions from Q. 3 to 7.
All questions carry equal marks.
Q.1 Choose correct alternatives. 06
For rhombohedral crystal system γ
120 90
120 90
For tetragonal crystal system
a b c a b c
a b c a b c
For fcc system the number of atoms per unit are
7 5
6 4
The range of Far IR is
0.025 0.5 mm 0.25 5mm
0.25 0.5 mm 0.025 5mm
IR absorption occurs due to
Change in electron configuration
Symmetric vibrations
Asymmetric vibrations
None of above
In XPS, photoelectrons are produced using
X-rays β-rays
γ-rays α-rays
Fill in blanks 04
For hexagonal crystal system
The indices l are coefficient of a vector perpendicular to
that plane.
FT-IR uses a laser as an internal wavelength standard.
The interplanar distance increases with
State True/False 04
Number of atoms per unit primitive cell depends on the type of crystal
system.
In case of tetragonal crystal system a b c
In XPS, Spin orbital splitting and peak area ratios assist in element
identifications.
Number of atoms per unit bcc system are 4.
Page 2 of 2
SLR-VN-383
Q.2 Write a note on:
Attenuated Total Reflection 04
Beer Lamberts law 05
Crystal symmetry and reciprocal lattice 05
Q.3 How we can determine lattice parameters and crystal structure in tetragonal
system.
10
What is the effect of ionic radius on to the lattice parameters? 04
Q.4 Describe basic principles and instrumentation for the XPS system. 10
Write note on Energy losses in XPS. 04
Q.5 How atomic form and structure factor is determined in simple cubic system. 10
Gives the applications of Infra-red spectroscopy? 04
Q.6 Describe basic principle, working and applications of the Raman
spectroscopy?
10
Give the difference between stokes and antistokes scattering. 04
Q.7 Draw and explain instrumentation set of FTIR spectroscopy. 10
Draw and explain energy levels in Infra red absorption. 04