Rotational energy of diatomic molecules
Theory of molecular spectra

Article REF: P2656 V1

Rotational energy of diatomic molecules
Theory of molecular spectra

Author : Alain PETIT

Publication date: March 10, 2002, Review date: January 5, 2017 | Lire en français

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5. Rotational energy of diatomic molecules

Initially, we treat the molecule as a rigid rotator, consisting of two masses M _A and M _B connected by a rigid rod of length R ₀ , rotating about an axis through its center of mass (figure 5 ).

The moment of inertia about this axis is given by :

$I = μ R_{0}^{2}$

with :

µ: reduced mass (equation...

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General works

(1) - BANWELL (C.N.) - Fundamentals of molecular spectroscopy - . McGraw-Hill, New York (1966).
(2) - BARROW (G.M.) - Introduction to molecular spectra - . McGraw-Hill, New York (1962).
(3)...

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