Abstract
The Zeeman effect in microwave spectroscopy has proved to be a fruitful source of information for molecular and nuclear magnetic moments. The molecular moment, which results from rotation, can be directly determined from the Zeeman splitting, if the molecule is not electronically paramagnetic and is free from any nuclear coupling. Experimental data on the rotational moments of some polyatomic molecules are presented. Results of a quantum mechanical theory of the rotational moment in a symmetric top molecule are summarized. In the case of a nuclear coupling, the Zeeman spectra of the rotational fine-structure lines are analyzable in terms of the combined effect of the nuclear and molecular (rotational) magnetic moments. Some new data on nuclear magnetic moments have been obtained by this procedure.
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