Microwave absorption measurements have been made on the hydrogen sulfide molecule using a semiconfocal-type Fabry-Perot interferometer in the millimeter wave region. The 10, 1 → 11, 0 and 21, 1 → 22, 0 transitions of H2S33 with S33 in its natural concentration of 0.7% have been observed in this video spectrometer. Q values (Q=f/Δf) on the order of 56 000 were measured at 168 kMc in the semiconfocal resonator. A comparison is given between lines observed in the interferometer and those observed in standard waveguide absorption cells.
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Lichtenstein et al. (1963) studied this question.
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