Rotational energy of diatomic molecule is given by,

$$ E_J = \frac {\hbar ^2}{2I} J( J+1 )$$

Where,

I = Moment of inertia of diatomoc molecule.

J = Rotational quantum number.

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# What is the formula of rotational energy of diatomic molecule?

$$ E_J = \frac {\hbar ^2}{2I} J( J+1 )$$

Where,

I = Moment of inertia of diatomoc molecule.

J = Rotational quantum number.