ELECTRIC MOMENTS AND EFFECTIVE CHARGES OF HCL AND DCl
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Date
1951
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Ohio State University
Abstract
The sign of the effective charge $(d\mu/dr)$ for HCl has been obtained from the infrared dispersion measurements. This follows from the measurements of the electric moments of HCl and DCl and the small difference in average internuclear distances. The electric moments were calculated from each experimental value of the index beyond 8 microns, after a correction was made to the visible-index data for the contribution of the vibrator. It was therefore also necessary to calculate new values for the effective charges from the short-wavelength values of the $index.^{1}$
Description
$^{\ast}$ Now with the Polychemicals Department, du Pont Experimental Station. Wilmington, Delaware $^{1}$ Values of these constants are, $\begin{array}{lll} & HCl & DCl\\ \mu& 1.12_{0} & 1.14_{5} \times 10^{-18} esu\\ d\mu/dr & 0.95_{4} & 1.00_{1} \times 10^{-10} esu\end{array}$ Corroboratory evidence has been obtained from the work of Bell and $Coop.^{1}$ The index measurements were extrapolated to infinite wavelength to provide an extremely accurate point on the curve of dielectric constant vs. 1/T. The recalculated values of the moment show the same sign for $d\mu/dr$ as from this work. An argument has been developed to suggest that the sign of the electric moment of HCl is negative, i.e., that the proton end is negatively charged. This was based on the measurements of the mass of the deuteron by Hardy, Barker, and $Dennison^{2}$ and the assumptions necessary to calculate this constant from the fine structure of the rotation-vibration bands of HCl and DCl.
Author Institution: Department of Physics, University of Wisconsin
Author Institution: Department of Physics, University of Wisconsin