Abstract
A spectrometer for infrared microwave double resonance with an intense Stark field is described that is useful for accurate determination of dipole moments and other electric properties of molecules. High precision and sensitivity are attained by the use of gold-coated glass optical-flat Stark plates, a white-type multiple reflection optical path, and microwave frequency stabilization. The spectrometer was tested by observing double resonances in H2CO with a CO laser as an infrared light source, and was shown to be adequate for measurement of dipole moments to better than ±10−4D.
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