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Beam-type masers for radiofrequency spectroscopy of molecules are considered. The theoretical estimate of sensitivity is discussed and a table of minimum detectable beam intensity and estimate of available beam intensity for some of the low frequency transitions is given. A K -type doubling transition, 4 31 →4 32 , of formaldehyde was observed as an emission line at 4.5769±0.0023 Mc, and compared with theories. The observed saturation in focusing is probably due to the non-adiabatic change of rotational states in the focuser. The saturation broadening of the line with increasing rf field shows agreement with theory.
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Shimoda et al. (1960) studied this question.
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