Chapter 14, Problem 14.11E

Interpretation Introduction

Interpretation:

The energies of the first four rotational levels for the molecule ${}^{\text{79}}{\text{Br}}^{\text{19}}\text{F}$ are to be predicted.

Concept introduction:

For a diatomic molecule, $\Delta E$ in a rotational transition is the difference of energies of two adjacent states. The difference in energies is expressed by the difference between final and initial states. In the spectrum, each energy level is equally spaced by a difference of $2B$. The first four lines appearing at $2B,4B,6B,$ and $8B$.