Chapter 14, Problem 14.91E

Interpretation Introduction

Interpretation:

The reason as to why line $P\left(0\right)$ is not present in the table which contains the list of frequencies of absorptions by a molecule is to be stated.

Concept introduction:

The P and R branch of lines are produced because of rotational and vibrational spectrum occurring together. The P and R branch of lines are due to change in the rotational level of molecule with the vibrational change. There are some selection rules for the transitions to occur according to whichthese lines are formed and named as P and R branch lines.