Abstract
By re-investigating the Raman spectrum of C2N2 we have obtained, in addition to the frequencies already known1, four more frequencies: 521.4 cm.−1, 561.4 cm.−1, 841 cm.−1 and 2298.4 cm.−1. The last one, which appears as a weak satellite to the very strong 2328.5 cm.−1, is most probably an isotope line due to C12C13N214, and enables us to calculate the complete harmonic potential function using some infra-red frequencies also2. In order to get an interpretation of the physical nature of the potential function, it is helpful to calculate the forces called into action on different atoms i by special atomic displacements. Considering only displacements, Δx, along the axis of the linear molecule, these forces are given by
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References
Herzberg, G., “Infrared and Raman Spectra of Polyatomic Molecules” (New York, 1946).
Bailey, C. R., and Carson, S. C., J. Chem. Phys., 7, 859 (1939).
Coulson, C. A., and Longuet-Higgins, Trans. Farad. Soc., 43, 88 (1947).
Coulson, C. A., Trans. Roy. Soc., A, 169, 413 (1939).
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LANGSETH, A., MØLLER, K. A Correlation of Restoring Coefficients in Molecular Potential Functions and Bond Orders Between the Different Atoms in Polyatomic Molecules. Nature 166, 147–148 (1950). https://doi.org/10.1038/166147a0
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DOI: https://doi.org/10.1038/166147a0
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