STRUCTURE DETERMINATION OF $CO_{2}-HF$ BY MOLECULAR BEAM ELECTRIC RESONANCE SPECTROSCOPY
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Date
1980
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Ohio State University
Abstract
The molecular beam electric resonance technique was used to obtain rotational spectra of $CO_{2}-HF$ a weakly bound species formed by nozzle expansion of an HF, $CO_{2}$, and Ar mixture. The spectroscopic results indicate that the $CO_{2}-HF$ system is nearly linear, and furthermore, study of the $CO_{2}-DF$ system shows that the hydrogen points towards the $CO_{2}$ unit. The spectroscopic constants are used to determine two structural parameters in each system: r, the distance between the centers of mass of the a-axis of the molecule, and $<\cos^{2}\theta>$, where $\theta$ is the angle between the HF unit and the a-axis of the molecule. The latter quantity is determined from (eqQ)$_{D}$, for $CO_{2}-DF$, and from $S_{HF}$, the spin-spin coupling constant, for $CO_{2}-HF$. Finally, the centrifugal distortion constant D is related to the strength of the weak bond. The molecular constants are :[FIGURE]
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