Chapter 7, Problem 7E.15P

Interpretation Introduction

Interpretation:

The allowed transitions occur when $\nu \text{'}=\nu \pm 1$ has to be justified.

Concept introduction:

A harmonic oscillator consists of a particle of mass $m$ that undergoes a restoring force which is proportional to its amplitude $x$.  The restoring force is represented by $k_{\text{f}}$ which is known as the force constant.  The vibrational frequency is $\omega$.  It is directly proportional to the force constant.  The intensity of transitions depend on the relative population of the states and the population depends on the temperature.  The more the population, more is the intensity.