A description is given of a molecular beam apparatus which extends high resolution absorption spectroscopy into the shorter millimeter wavelength region (up to 500 GHz). A parallel-plate-type absorption cell, allowing for Stark modulation, is used with the molecular beam passing between the plates. The half-width of the absorption lines is about 5 kHz at a resonance frequency of about 200 GHz.
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C. Huiszoon (1971) studied this question.
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