THE MEASUREMENT AND INTERPRETATION OF $T_{1}$, AND $T_{2}$ IN THE INVERSION DOUBLETS OF $^{15}NH_{3}$ AND THE ROTATIONAL TRANSITIONS IN OCS

Abstract

Transient experiments have been completed to measure $T_{1}$ and $T_{2}$ as a function of pressure for the inversion transitions in several (J, K, |M| = J) states in $^{15}NH_{3}$ and in the J = 1 $\rightarrow$ J = 2, $M = \pm 1$ transitions in OCS. In OCS, $T_{1} = T_{2}$ for both the $J = O \rightarrow J = 1, M = O$ and $J = 1 \rightarrow J = 2$, $M =\pm 1$ transitions. In $NH_{3}$, however, the ratio $T_{2}/T_{1}$ varies over the range $1.0 \leq T_{2}/T_{1} \leq 2$. 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.