Abstract
The microwave Faraday effect is proposed as a method of measuring rotational magnetic moments in gases. The theory of the Faraday effect is developed by using the method of Karplus and Schwinger. In particular, it is applied near a microwave absorption frequency of the gas. The magnitude of the effect indicates that the Faraday effect may be a more satisfactory method of measuring small (less than 0.1 nuclear magneton) magnetic moments than the Zeeman effect. However, it requires intensity rather than frequency measurements and is therefore difficult.

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