UPSC Combined Geo-Scientist, Mains · 2020 · Mains Paper II

Q15(a). Rotational constant versus bond length and reduced mass

5 marks
Topic: Basic principles and applications of spectroscopy
Question only

Question

Define the rotational constant of a molecule. How will its value change with the equilibrium bond length and reduced mass?

Model answer

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Coversrotational constantmoment of inertiareduced massB = h/8π²cI

All parts of Question 15

15(a) Rotational constant versus bond length and reduced mass5 marks
15(b) CO₂ bending mode: IR active, Raman inactive5 marks
15(c) Photodimerisation of anthracene: [A₂] independent of [A]10 marks