Chapter 14, Problem 14.71E

Interpretation Introduction

Interpretation:

The harmonic vibrational frequencies and the anharmonicity constants for $\text{FeH}$ and $\text{FeD}$ are to be calculated.

Concept introduction:

The two types of oscillators are simple harmonic oscillator and anharmonic oscillator. The main difference between these two is that the simple harmonic oscillator assumes that the bond between two atoms never breaks during the vibration while anharmonic oscillator considers that bond may break due to vibration if enough amount of energy is supplied to the molecule.