MILLIMETER WAVELENGTH INTERFEROMETRY OF UNSTABLE MOLECULES ZEEMAN EFFECT IN CARBON MONOSULFIDE.
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Publisher:Ohio State University
In the microwave investigation of free radicals or unstable molecules, the reactivity of the molecular species with the cell walls usually places limitations on the observation time and consequently on the absorption path length. The use of a Fabry-Perot interferometer provides an open structure through which the radical or molecule can be flowed with relatively little contact with the interferometer plates; in addition, a long effective absorption path can be obtained with a small resonator. The techniques of microwave Fabry Perot interferometers are reviewed and applications are described. Experiments on the Zeeman effect of CS are described. A small low Q interferometer was employed to fit in the gap of the magnet. An effective path length of 1.3 meters was obtained. Transitions for which $\Delta M=0\pm 1$ were observable with the interferometer. For CS, the molecular g-value is found to be $\pm (0.269 \pm 0.005)$.
Author Institution: Electromagnetics Laboratory, Martin Marietta Corporation