Chapter 14, Problem 14.100E

Construct and compare the energy level diagrams for the rotations of a diatomic molecule assuming it acts as a rigid rotor (equation $14.21$) and a rigid rotor with centrifugal distortion corrections (equation $14.26$). Use $\text{HBr}$ as a model system, where $B=8.473{\text{cm}}^{-1}$ and $D_J=3.72\times {10}^{-4}{\text{cm}}^{-1}$. Compare rotational levels up to $J=20$.