Chapter 8, Problem 8C.3AE

Interpretation Introduction

Interpretation:

The transitions that are allowed in the electronic emission spectrum of hydrogenic atom have to be identified.

Concept introduction:

On passing an electrical discharge through gaseous hydrogen, the ${\text{H}}_{\text{2}}$ molecules get dissociated and the excited $\text{H}$ atoms produce electromagnetic emission spectrum in the form of spectral lines.  Spectroscopic transitions are allowed if they can occur or forbidden when they cannot.  A selection rule is a set of rules that have to be followed for the transitions to be allowed.