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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper II covers physical chemistry.

UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper II

Q10(a). Stokes and anti-Stokes intensities: rotational vs vibrational Raman

Question

The anti-Stokes lines of the pure rotational Raman spectrum of a molecule are roughly of the same intensity as the Stokes lines, but anti-Stokes lines of the vibrational Raman spectrum are generally much weaker than the Stokes lines. Account for the observation.

Model answer

The free solution for 2018 answers questions 1, 2, 3, 4, 5, 6, 8, 12, 13 and 15, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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CoversRaman spectroscopyStokes and anti-Stokes linesBoltzmann populationrotational Raman

All parts of Question 10