ROTATIONAL RELAXATION TIMES OF OCS AND $NH_{3}$ FROM THE MICROWAVE NUTATION SIGNALS
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Date
1975
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Ohio State University
Abstract
The time dependence of the microwave absorption of OCS and $NH_{3}$ was measured under the on- and off-resonant conditions, utilizing Stark and source modulation, respectively. For OCS the effective pressure parameters obtained under the two conditions, which correspond, respectively, to ($T_{1}^{-1} + T_{2}^{-1})/4\Pi P$ and ($T_{2}\Pi P)^{-1}$ according to the Bloch equation, are different beyond experimental error; the difference ($T_{2}^{-1} - T_{1}^{-1})/2\Pi P$ is $0.94 \pm 0,38(2.5\sigma$) MHz/Torr for $J = 2 \rightarrow 1$. This difference as also determined to be $1, 19 \pm 0.30$ MHz/Torr from the dependence of the nutation frequency on the microwave power. For the inversion transitions of $NH_{3}$, the pressure broadening parameters $\Delta\nu_{p} = (2\Pi T_{2}P)^{-1}$ were determined under off-resonant conditions and agreed with those obtained from line width measurement. Pressure Broadening Parameters:($T_{eff}2\Pi P)^{-1}$ MHz/Torr[FIGURE]
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Author Institution: Department of Chemistry, Kyusyu University