Abstract
The infrared absorption spectrum of thin films of LiH and LiD was obtained at room temperature for the region 12.5-25 \ensuremath{\mu}. The primary feature of the spectrum is a broad but definite absorption peak which occurs at 17.0 \ensuremath{\mu} for LiH and at 22.4 \ensuremath{\mu} for LiD. The observed ratio of the wavelengths is 1.32\ifmmode\pm\else\textpm\fi{}0.02, in excellent accord with the ratio of the square root of the reduced masses, 1.33. This agreement is a confirmation of the elementary Born theory of lattice vibrations.
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