A Cavity Type Absorption Cell for Double Resonance Microwave Spectroscopy

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Abstract
An experimental dual resonant cavityabsorption cell to observe microwavespectroscopic double resonance effects is described. This device is composed of two Fabry‐Perot interferometers excited by independent microwave sources and mounted at right angles in a suitable vacuum enclosure. The pumping transition is modulated by one source and the modulation induced on the rf absorption in the orthogonal cavity is detected. Preliminary experimental data are presented to show signal amplitude variations for two connected transitions of methylene chloride, 000 → 111=35 067.0 MHz and 111 ← 202=15 911.9 MHz, as microwave power levels and cavity Q's were varied. Sensitivities obtained are comparable to those of conventional Stark‐modulated microwave spectrometers, and further improvements appear possible.

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