Rotation of a rigid diatomic dipole molecule in a homogeneous electric field - II. Energy levels when the field is zero, very weak or very strong

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The energy quantization problem for a rigid diatomic electric dipole molecule in a homogeneous static electric field is considered. The field-free case is treated in some detail, since it is difficult to find a comprehensive treatment in the literature. For the limiting case of very weak fields the available results of conventional perturbation theory are presented in lucid form. For the limiting case of very strong fields an easily survey able perturbation calculation is performed.