Abstract
Transient nutation is observed in the time-resolved infrared-microwave double resonance of ammonia. This behavior is described by a Bloch equation for relaxation of the ammonia inversion levels, with an effective ${T}_{2}$ cross section of 400 \ifmmode\pm\else\textpm\fi{} 50 ${\mathrm{\AA{}}}^{2}$. A similar effect was produced by rapidly switching the Stark field applied to the molecules, which suddenly brings them into resonance with the cw microwave radiation.
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