Question

Anharmonic motion on rotational vibrational

Answer 1

Answer:

Introduction of non-rigidity in a rotor or anharmonicity in a harmonic oscillator leads to the bunching of higher energy levels. The rotational vibrational spectra of polyatomics give rise to the P, Q and R branches. Vibrations of polyatomics can be conveniently studied in terms of the 3N-6 normal modes.