Letter | Published:

Infra-red and Raman Spectra of Crystalline Hydrochloric Acid

Nature volume 142, page 669 (08 October 1938) | Download Citation



A KNOWLEDGE of the vibration-rotation spectra of crystalline hydrochloric acid is of considerable importance in view of the theories of Pauling1, Fowler1, and others on rotation in the solid state. Although several investigators have taken up this problem, the existing experimental data are confusing and even conflicting. Thus Hettner2 has reported that in infra-red absorption a doublet band is found below the transition point (98° K.) and a single absorption maximum above it. On the other hand, Shearin8 has reported the existence of thirteen discrete rotation lines at liquid air temperature (that is, around 85° K.) and this result has recently been quoted4 as indicating that rotation exists below the transition point. It seemed possible that the discrepancy between those two results might be due to the fact that Shearin had the higher resolving power of a grating at his disposal. We have just completed a very careful examination of the absorption near 3.7µ of thin layers of solid hydrochloric acid at the temperature of liquid air, using a grating spectrometer at least equal to that of Shearin's in resolving power.

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    , Phys. Rev., 46, 430 (1930); , Proc. Roy. Soc., A, 149, 1 (1935).

  2. 2.

    , Z. Phys., 89, 234 (1934).

  3. 3.

    , Phys. Rev., 48, 299 (1935).

  4. 4.

    , and , Z. phys. Chem., B, 39, 371 (1938).

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    and , J. Chem. Phys., 2, 317 (1934).

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  1. Laboratory of Physical Chemistry, Cambridge. Aug. 27.

    • E. LEE
    • , G. B. B. M. SUTHERLAND
    •  & C. K. WU


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