Infrared Absorption Wavelengths for Solid LiH and LiD

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Abstract
The infrared absorption spectrum of thin films of LiH and LiD was obtained at room temperature for the region 12.5-25 μ. The primary feature of the spectrum is a broad but definite absorption peak which occurs at 17.0 μ for LiH and at 22.4 μ for LiD. The observed ratio of the wavelengths is 1.32±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.