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A formula to describe the splitting of rotational energy levels in polyatomic molecules, brought about by interaction of the magnetic field produced by rotation with electron spin and orbital angular momenta, is derived by perturbation methods on the basis of simplifying assumptions. The formula is then fitted to experimental data obtained from observations on fine structure in the spectrum of chlorine dioxide. The agreement is quite satisfactory.
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R. S. Henderson (1955) studied this question.
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