The Infrared Spectrum of H 2 Cl
1932; American Institute of Physics; Volume: 42; Issue: 2 Linguagem: Inglês
10.1103/physrev.42.279
ISSN1536-6065
AutoresJ. D. Hardy, E. F. Barker, David M. Dennison,
Tópico(s)Atmospheric and Environmental Gas Dynamics
ResumoThe fundamental absorption band due to HCl molecules involving the heavier isotope of hydrogen has been observed, using a cell 700 cm long with gas at atmospheric pressure. It lies in the region of 4.8\ensuremath{\mu}. Both ordinary HCl and samples enriched in ${\mathrm{H}}^{2}$ were examined. Nineteen lines have been measured in the band of ${\mathrm{H}}^{2}$${\mathrm{Cl}}^{35}$, and seventeen in the band of ${\mathrm{H}}^{2}$${\mathrm{Cl}}^{37}$. The estimated abundance of ${\mathrm{H}}^{2}$ relative to ${\mathrm{H}}^{1}$ is 1 to 35,000.A satisfactory equation has been developed for the positions of these lines on the basis of measurements by Meyer and Levin upon the bands of ${\mathrm{H}}^{1}$Cl, assuming identical dimensions and force fields for both molecules. The parameter $\ensuremath{\rho}$ of this equation, representing the ratio of the reduced masses for ${\mathrm{H}}^{2}$Cl and ${\mathrm{H}}^{1}$Cl, has been adjusted to give the best agreement with the observed frequencies, and is found to be $\ensuremath{\rho}=0.514430\ifmmode\pm\else\textpm\fi{}0.000004$. Sources of error other than those involved in the observations are discussed, and an attempt is made to evaluate them. When these are taken into account, the values indicated for the mass of ${\mathrm{H}}^{2}$ (on the scale ${\mathrm{H}}^{1}$=1.00778 for the mass defect are: mass ${\mathrm{H}}^{2}$=2.01367\ifmmode\pm\else\textpm\fi{}0.00010, mass defect=0.00189\ifmmode\pm\else\textpm\fi{}0.00010. These values are compared with the results obtained by Bainbridge with the mass spectrograph.
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