Vibrational spectra (Question 2 (7+8=15 Marks)) — UPSC Physics Optional IFoS 2023 Paper II

(i) Homonuclear diatomic molecules do not give any pure rotational or vibrational spectra, whereas they do give a rotational Raman spectra. Comment. (ii) The separation between the adjacent rotational Raman lines is 4B in hydrogen molecule, whereas in oxygen molecule it is 8B. Why?