Abstract
A microwave bridge is described which permits radiation from two sources to be propagated through a gas and to be detected separately even when the sources are operating at the same frequency. This bridge is used to study the shape of the (J,K)=(3,3) inversion line in N14H3 when the molecules are subjected to a strong resonant or near-resonant pumping field. The shape of the line is studied by measuring the absorption of a much weaker probe field. For sufficiently strong pump fields, power can be removed from the pump and transferred to the probe field, causing the latter to be amplified. The results are in quantitative agreement with theory. However, the development of a theory which satisfactorily includes the consequences of the degeneracy of the molecular energy levels has not yet been accomplished.
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