THE RAMAN SPECTRUM OF CYANOGEN
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Date
1974
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Ohio State University
Abstract
The Raman spectrum of gaseous cyanogen was studied under high resolution using techniques described $elsewhere.^{1,2}$ The pure rotational, spectrum was photographed in 4 1/2 and 6 1/2 hours using a gas pressure of 50 torr and a spectral slit width of $0.025 cm^{-1}$. The pure rotational spectra in the ground state as well as in the $\nu_{5}$ and $2\nu_{5}$ excited states were observed. The rotation-vibration spectrum in the neighborhood of the band was photographed in 11 and 15 hours using a gas pressure of 200 torr and a spectral slit width of $0.060 cm^{-1}$. The ``hot” band transitions $\nu_{1} + \nu_{5} - \nu_{5}$ and $\nu_{1} + 2\nu_{5} - 2\nu_{5}$ were also observed. The following molecular constants, all in units of $cm^{-1}$, were determined. From the pure rotation specturm (S-branch transitions only): \begin {eqnarray*} B_{(00000)}=0.157218 \pm 0.000004; \ \ D_{(00000)}=(3.08 \pm 0.03) \times 10^{-8}\\ B^{c}_{(00001)}=0.157375 \pm 0.000011; \ \ D^{c}_{(00001)}=(0.96 \pm 0.09) \times 10^{-8}\\ B^{d}_{(00001)}=0.157494 \pm 0.000016; \ \ D^{d}_{(00001)}=(1.03 \pm 0.14) \times 10^{-8}\\ \end {eqnarray*} From the rotation-vibration spectrum: \begin {eqnarray*} \nu_{1} \ band: \quad \quad \quad \quad \nu_{1}=2330.515 \pm 0.002 \\ B_{(10000)}=0.156394 \pm 0.000011; \ \ D_{(10000)}=(3.39 \pm 0.28) \times 10^{-8}\\ B_{(00000)}=0.157216 \pm 0.000012; \ \ D_{(00000)}=(3.61 \pm 0.32) \times 10^{-8}\\ \nu_{1} +\nu_{5}-\nu_{5}\ band : \quad \quad \quad \nu_{1} +\nu_{5}-\nu_{5}\ =2327.667 \pm 0.002\\ B_{(10001)}=0.156856 \pm 0.000023; \ \ D_{(10001)}=(3.02 \pm 1.56) \times 10^{-8}\\ B_{(00001)}=0.157766 \pm 0.000021; \ \ D_{(00001)}=(10.0 \pm 1.3) \times 10^{-8}\\ \end {eqnarray*} These results will be discussed in the light of available infrared $data.^{3-5}$ Further work is in progress. This work was supported, in part, by a grant from the National Science Foundation.
Description
$^{1}$A. Weber and J. Schlupf, J. Opt. Soc. Am. 62, 428 (1972). $^{2}$J. Schlupf and A. Weber, App. Opt. 10, 2373 (1971). $^{3}$A. Maki, J. Chem. Phys. 43, 3193 (1965). $^{4}$A. Bersekkubu abd C. Meyer, Compt. Rend. 270B, 1672 (1970). $^{5}$A. Picard-Bersellini, Compt. Rend. 273B, 353 (1971).
Author Institution: Department of Physics, Fordham University
Author Institution: Department of Physics, Fordham University