The v3- v4 difference band contribution to the CCI4 symmetric stretch (v1) mode
The Raman spectrum of the symmetric stretching vibration (ν1) of liquid carbon tetrachloride observed at 295 K and reported repeatedly over the last 80 years clearly shows four of the five more abundant isotopomers at 440–470 cm−1. At the lower energy end of this spectrum, additional intensity due to isotopomeric contributions from the symmetric stretch for v = 1 2 (hotbands) partially overlaps the prominent v = 0 1 features, and accounts for about 18% of the integrated intensity at 295 K in agreement with theory. When these two patterns are modeled and subtracted from the experimental spectrum, a feature underlying almost exactly the C35Cl4 (v = 0 1) band at 462.5 cm−1becomes apparent. We propose that this feature is the ν3 − ν4 difference band. Observations at lower temperatures, and of the combination bands, and the polarized Raman spectra are consistent with this hypothesis.
Author Supplied Keywords
Carbon tetrachloride, CCl4, Fermi resonance, Difference band, Combination band, Hot band, Isotope effect, Isotopic fine structure, Symmetric stretch, Raman spectroscopy, Lorentzian lineshape function
Carbon tetrachloride; Raman spectra; Vibrational spectra
Citation: Pilot Scholars Version (Modified MLA Style)
Gaynor, James D.; Wetterer, Anna M.; Valente, Edward J.; and Mayer, Steven G., "The v3- v4 difference band contribution to the CCI4 symmetric stretch (v1) mode" (2015). Chemistry Faculty Publications and Presentations. Paper 30.
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