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We have found that room-temperature HF gas at millitorr pressures, optically pumped to produce a total inversion at a rotational transition in the v=1 vibrational state, emits a superradiant pulse with ringing after a considerable delay (microseconds). A semiclassical analysis shows that for a high-gain system the pulse evolution is determined by a single parameter ₑ, and that inhomogeneous broadening is unimportant. Close agreement between theory and experiment is obtained.
Skribanowitz et al. (Mon,) studied this question.