Chapter 11, Problem 11F.1BE

Interpretation Introduction

Interpretation:

The excited state configuration corresponding to term symbol ${}^3{\Pi }_{\text{u}}$ has to be predicted.

Concept introduction:

A term symbol describes the orbital, spin and total angular momenta of an electronic state.  The symbol $L$ represents the vector sum of orbital angular momentum.  The symbol $S$ represents the vector sum of spin angular momentum.  The symbol $J$ represents the total angular momentum.  Therefore, the term symbol is represented as given below.

    ${}^{2S+1}{L}_J$

In case of diatomic molecules, the term symbol is given by the formula as shown below.

    ${}^{2S+1}{\Lambda }_{\Omega }$