Abstract:
The method of delaying stimulated emission relative to the beginning of an initiating light pulse was used
in the determination of the relaxation constants of vibrationally excited
$\operatorname{HF}^*$ molecules interacting with
chlorine fluorides. The following effective constants were obtained: $\operatorname{HF}_{\nu=2}+\operatorname{ClF}_5\overset{k}\to\operatorname{HF}_{\nu=1}+\operatorname{ClF}_5$, $k=(1.8\pm 0.6)\times 10^5\operatorname{sec}^{-1}\cdot\operatorname{Torr}^{-1}$; $\operatorname{HF}_{\nu=2}+\operatorname{ClF}\overset{k}\to\operatorname{HF}_{\nu=1}+\operatorname{ClF}$, $k=(5.8\pm 1)\times 10^3 \operatorname{sec}^{-1}\cdot\operatorname{Torr}^{-1}$;
$\operatorname{HF}_{\nu=1}+\operatorname{ClF}_3\overset{k}\to\operatorname{HF}_{\nu=0}+\operatorname{ClF}_3$, $k=(2\pm 0.6)\times 10^5 \operatorname{sec}^{-1}\cdot\operatorname{Torr}^{-1}$. The vahies obtained for the $\operatorname{ClF}_3$ and $\operatorname{ClF}$
molecules were of the same order of magnitude as the values found by thie luminescence decay method.