Molecular Physics-Elementary Theory of Rotational, Vibrational and Electronic Spectra of Diatomic Molecules [IAS (Admin.) Mains Physics]: Questions 1 - 6 of 20

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Question 1

Appeared in Year: 2011 (IFS)

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Give the elementary theory of NMR. Explain the two different relaxation processes. (Paper – II)

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Explanation

  • In Nuclear Magnetic Resonance (NMR) , the frequency of processing nucleus is equal to the frequency of rotating magnetic field. Here it is important to notice that in NMR we are not performing experiments on the electron, it all about the nuclei of the nucleus.
  • The principle of NMR is dependent on the spins of atomic nuclei. Consider, the subatomic …

… (891 more words, 22 figures) …

Question 2

Appeared in Year: 2010

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In CO molecule line occurs at a frequency Calculate the moment of inertia of CO molecule. (Marks: 10)

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Question 3

Appeared in Year: 2015

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The observed vibrational frequency of molecule is . What is the effective force constant of the molecule? (10 Marks)

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Question 4

Appeared in Year: 2010

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Is it possible to obtain pure rotational spectra of and molecules?

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Explanation

  • Molecules that have permanent electric dipole moments can absorb or emit electromagnetic radiation in for infra-red or microwave transition. It means that homonnuclear diatomic molecules such as symmetric linear molecules such as

… (27 more equations) …

Question 5

Appeared in Year: 2010

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Discuss occurrence of rotational energy levels of a diatomic molecule and show that the pure rotation spectrum of such a molecule consists of a series of equally spaced lines separated by a constant wave number difference . write down the selection rules.

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Explanation

  • As we know, all (heteronuclear) diatomic molecules with “unlike” atoms, for which the Centers of positive and negative charges do not coincide, have a permanent dipole moment. During the rotation of the molecule, the component of the dipole moment in a fixed direction changes periodically with the frequency of rotation,

… (2502 more equations, 81 figures) …

Question 6

Appeared in Year: 2003

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The rotational spectrum of consists of equidistant lines with a separation of . Calculate the (a) M. I and (B) band length of molecule.

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Explanation

The separation is given by (gives)

The rotational constant is given b…

… (187 more equations) …