It is now nearly axiomatic among Platonic scholars that the Timaeus and its unfinished sequel the Critias belong to the last stage of Plato's writings. The Laws (including, for those who admit its claims, the Epinomis) is generally held to be wholly or partly a later production. So, by many, is the Philebus, but that is all. Perhaps the privileged status of the Timaeus in the Middle Ages helped to fix the conviction that it embodies Plato's maturest theories.
From the above preliminary studies on the Zeeman effect in the absorption spectra of gas molecules, it is seen that a knowledge of the nuclear and molecular g-factors can be obtained from the analysis of Zeeman splitting, if there exists a spin-rotation coupling. If one g-factor is known, the other g-factor can be determined from the experimental data, on the basis of known spin and rotational quantum numbers. By studying the Paschen-Back effect at strong fields in conjunction with the analysis of the Zeeman effect, it will be possible to evaluate the two g-factors separately.If the spin-rotation coupling is absent, the Zeeman splitting of the spectral lines of a molecule will yield direct information on the molecular g-factor. This information bears a close relationship to the charge distribution in a molecule and may throw some light on the nature of molecular bonds. The same knowledge should be particularly useful for the study of the interaction between the nuclear magnetic moment and the magnetic moment resulting from molecular rotation. Also, if the spectral lines of a molecule differ among themselves in their characteristic Zeeman patterns, the Zeeman studies can lend much help to the identification and assignment of molecular lines.A new magnet-cavity assembly has now been built which is capable of yielding a magnetic field of the order of 10,000 oersteds. It is planned that more intensive investigations will be carried out for a large class of molecules in both the Zeeman and Paschen-Back spectra.ACKNOWLEDGMENTS
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