Lattice Vibrations of the Solids N_2, CO_2, and CO

Publication

Reference: Ron Arza, Schnepp O. (1967). Lattice Vibrations of the Solids N$_2$, CO$_2$, and CO. J. Chem. Phys., 46, 3991 - 3998.

Names

Title: Lattice Vibrations of the Solids N$_2$, CO$_2$, and CO
Abstract: The far-infrared absorptions of the solids N$_2$, CO$_2$, and CO have been investigated. Two bands were observed for each solid below 100 cm$^-1$ and the spectrum observed for CO$_2$ is in good agreement with that reported previously. The frequencies for N$_2$ have been found to be in good agreement with calculations based on the theory described by Walmsley and Pople. The absorption intensities have been calculated from the theory described in the preceding paper. The experimental values available for the intensities are uncertain to within a factor of 3 and the calculated and measured values agree well within this limit. It is concluded that the intensity theory has been shown to be valid to better than within a factor of 2 but a more precise test is contingent on the availability of more accurate experimental measurements. From the lack of agreement between calculated and observed intensity ratios between the absorption bands of the same substance, it is concluded that the quadrupole\textemdashquadrupole term is not adequate to describe the angle-dependent part of the intermolecular potential.
Keywords: spectroscopy, far-IR, ices, band position, band width, band intensity, molecular solids, CO2, CO, N2
Content: spectral data, band list data, experimental physics

Doi

10.1063/1.1840475

Identifiers