Knowledge Bank

Transient experiments have been completed to measure $T1$ and $T2$ as a function of pressure for the inversion transitions in several (J, K, |M| = J) states in $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}NH3$ and in the J = 1 $\to$ J = 2, $M=\pm 1$ transitions in OCS. In OCS, $T1=T2$ for both the $J=O\to J=1,M=O$ and $J=1\to J=2$, $M=\pm 1$ transitions. In $NH3$, however, the ratio $T2/T1$ varies over the range $1.0\le T2/T1\le 2$. These results are interpreted using a modified form for the Anderson theory of line broadening. Comparisons are made between the results of this work and earlier steady state double resonance work.