The Vibrational rotational spectra

The Vibrational Rotational spectra;

Since the vibrational and rotational energies of diatomic molecules are different. The rotation of molecule does not affect its vibrational motion.

Total energy of molecule.

R branch;

When transition occurs such that ∆𝝂 = +1, ∆j = +1. This branch of spectrum is called R branch.

Q branch;

When transition occurs such that ∆𝝂 = +1, ∆j = 0. This branch of the spectrum is called Q branch and this type of transition is not allowed in diatomic molecule.

P branch;

When transition occurs, such that ∆𝝂 = +1, ∆j = -1. This branch of the spectrum is called P branch.

Rotation Vibration transition.

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