Abstract
The infra-red absorption of hydrogen fluoride has been observed both with the prism and the grating spectrometer. The absorption in the vapor for the single molecules is as previously reported by Imes. At slightly longer wave-lengths a very strong absorption band due to the hydrogen bonding in the associated molecules is observed. In solution in carbon tetrachloride the single molecule spectrum undergoes considerable modification and no association is observed. This fact is rather surprising. The infra-red absorption of a thin crystal of potassium hydrogen fluoride was studied in order to fix the frequency of the hydrogen in the FHF- ion.
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