Rotational spectra — UPSC Physics Optional CSE 2026 Paper II

Find the positions of the first four rotational Raman lines in the spectrum of \text{H}_2, if its bond length is 0\cdot 742\text{ \AA}. What will be the effect of nuclear spin on the spectrum?

{[Given : Mass of {}^1\text{H} = 1\cdot 673 \times 10^{-27}\text{ kg}]}