THE INFRARED SPECTRA OF SOLID AMMONIA
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Date
1959
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Publisher
Ohio State University
Abstract
The infrared spectra of thin films of solid $NH_{3}$ and $ND_{3}$ have been studied as a function of temperature and of the conditions under which the films were deposited. Observations of the spectra were made with a prism spectrometer, using a low temperature cell of conventional design. Spectra have been obtained from the two metastable phases reported by the x-ray studies of Mauer and $McMurdie^{1}$, and from the stable cubic phase. The metastable phases were prepared by the deposition of solid films at $77^\circ K$ and at $112^\circ K$. The stable modification was obtained by deposition at $145^\circ$ and $170^\circ K$, and its spectra studied at temperatures down to $77^\circ K$. Differences were observed in the spectra of the; stable phase above and below $160^\circ K$, however both spectra were in agreement with the established cubic $structured^{2}$ No evidence of inversion doubling was observed. The frequencies, force constants and relative band intensities will be discussed in terms of the structures and the intermolecular bonding in the solid phases.
Description
$^{1}$ P. A. Mauer and H. F. McMurdie, presented at the 1958 meeting of the American Crystallographic, Association Milwaukee, Wisconsin $^{2}$ J. de Smedt, Bull Class Sci Acad. Roy. Belg. 11, 655 (1925); H. Mark and E. Pohland, Z. Krist 61, 532 (1925).
Author Institution: Oak Ridge National Laboratory
Author Institution: Oak Ridge National Laboratory