Knowledge Bank

Transient emission and off-resonant absorption methods are used to measure $T2$ in different M states of several (J,K) transitions in $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}NH3$, in the $JK-K+=211$ $\to$ $212$ transition in $H2CO$ and in the J = 1 $\to$ 2, M = 0, $\pm$ 1 transitions in OCS. No M dependence in $T2$ was observed. Transient emission signals were recorded and Fourier transformed in several (J,K) $\mathrm{<mrow\; data-mjx-texclass="ORD">15</mrow>}NH3$ transitions, some of which were doublets. Faithful spectra are obtained, and the time domain experiments hold some advantage in high-resolution microwave spectroscopy over the normal steady state technique.