Rotational—magnetic-field interactions of a molecule with zero electronic spin and zero orbital angular momentum are treated. The external magnetic field gives rise to interactions involving the molecular-magnetic-moment tensor (molecular g tensor), the magnetic-susceptibility tensor, and the nuclear magnetic-shielding tensor. The tensors are described in the principal inertial-axis system. Two types of molecules are considered. In the first case only external magnetic-field-induced nuclear-rotational couplings are present. In the second case a strong nuclear-quadrupole and spin—rotation coupling is added. The possibility of determining the diagonal elements in the above tensors by high-resolution microwave spectroscopy is discussed. Appropriate first-order expressions are given for a general asymmetric-top molecule.
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Hüttner et al. (1967) studied this question.