UPSC Combined Geo-Scientist, Mains · 2024 · Mains Paper II

Q10(a). The Franck–Condon principle

5 marks
Topic: Photochemistry
Question only

Question

Describe the Franck–Condon principle and its significance in photochemistry.

Model answer

The free solution for 2024 answers questions 1, 2, 3, 4, 5, 8, 9, 13, 14 and 15, the ones picked in its time plan. Question 10 is answered in full in the Geo-Scientist Chemistry Paper II, 2021 to 2025 book, with every part of every paper.

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UPSC Combined Geo-Scientist (Main) Chemistry Paper II: Model Answers 2021 to 2025

All fifteen questions of each paper, with the question printed above its answer
Numericals worked from formula to result with units; graphs with labelled axes
Topic-wise weightage and a topic-wise index

Printed copy Kindle edition Read sample pages

Topic notes: vibrational and electronic spectra (force constant, isotope effect, overtones, Franck–Condon), with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversFranck–Condon principlevertical transitionFranck–Condon factorelectronic spectraphotodissociation

All parts of Question 10

10(a) The Franck–Condon principle5 marks
10(b) Dissociation energy of Br₂ from the convergence limit5 marks