Master of Science II (Physical Chemistry)
Examination: Oct Nov 2016 Semester III (Old CGPA)
SLR No. Day
Date Time Subject Name Paper
No. Seat No.
SLR SD
237
Monday
21/11/2016
02:30 P.M
to
05:00 P.M
Molecular Structure I
C
XI
Instructions: Answer any five questions.
All questions carry equal marks.
(Section-I) Q.1 is compulsory.
Attempt any twoquestions from Section II
Attempt any two questions from Section III
Answer to all 5 questions (from Section II, III) should be
written in the one and the same answer book.
Figures to the right indicate full marks.
Total Marks:70
SECTION I
Q.1 Answer the following: 14
What is a symmetry operation?
List the symmetry elements and name the point group to which staggered
CH3CH3 and B2H6 belongs.
The lowest energy-state of an atom with electronic configuration ns1np1 has
the term
3P1 1P1 3P2 3P0
What is a point group?
A molecule absorbs a photon at λ=180 cm-1. The molecule is ionized and an
electron is emitted with velocity of 4.1x 105 ms-1. What kind of spectroscopy
is this and what is the binding energy of the photoelectron?
What pressure is best when performing an XPS measurement?
Explain the difference between Stokes and ant-Stokes lines in Raman
Spectroscopy.
Pure rotational spectrum of a diatonic molecule consists of many equally
spaced lines. Yes/No
What is the binding energy of an electron in XPS?
What is polarizability?
Give Maxwell-Boltzmann distribution law used to estimate the population of
the energy state.
Give any two examples of asymmetric top molecules.
Define predissociation phenomena.
What is Stark effect?
Page 1 of 2
SECTION II
Q.2 Explain in brief:
Principle moments of inertia and classification of molecules
ii) Effect of rotational angular momentum on intensity of microwave spectra.
07
Sketch and explain the polarisability ellipsoids for the H2O molecule. 07
Q.3 Discuss the theory and principle of vibrational- rotational Raman
spectroscopy.
07
What is anharmonic oscillator? Discuss the spectra of a diatomic vibrating
rotator.
07
Q.4 Outline the principle of photoelectron spectroscopy. 07
Explain in detail band origin and band head in the rotational fine structure of
electronic vibration spectra.
07
SECTION -III
Q.5 Explain the role of microwave spectra in determining exact atomic weights
and relative abundances of different isotopes.
05
Write a note on Zeeman effect. 05
Give the quantum theory of Raman effect. How rotational energy changes in
molecules can be studied using Raman effect.
04
Q.6 Discuss the applications of Raman Spectroscopy. 05
Find the symmetry elements present in XeF4 and XeF6. 05
HCI molecule has B of 10.6 cm-1and centrifugal distortion constant D of 5.3 x
10-4 Estimate the vibrational frequency and force constant of the
molecule.
04
Q.7 Write a note on any three of the following: 14
Orthogonality theorem
Transition probability
Fundamental vibrations and symmetry of molecule
Width of the spectral lines.