THE INFRARED SPECTRA OF THE DEUTERIUM AND TRITIUM SUBSTITUTED AMMONIA MOLECULES
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Date
1957
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Publisher
Ohio State University
Abstract
“The absorption spectra of the nine isotopic ammonia molecules, including NHDT, were studied with prism resolution over the region 5000 to $500 cm^{-1}$. The majority of the normal modes were assigned to observed bands. Through the use of four cells and the double beam technique, the spectrum of each of the molecules $NH_{2}D, NHD_{2}$, and $ND_{2}$ was obtained free from the absorptions of other isotopic species. A normal coordinate analysis has been performed, and corrections for the anharmonicity introduced by the use of modified spectroscopic masses” in computing elements of the G-matriees. Satisfaetory agreement has been obtained between the predicted and observed frequencies for the assigned modes. Evidence will be presented for re-assignment of the band center of $v_{3}$ in $ND_{3}$. The discussion will include the observed inversion splittings and the variations in band shapes and intensities resulting from the isotopic substitutions.”
Description
Author Institution: Oak Ridge National Laboratory, Oak Ridge