Infrared spectroscopy and intramolecular vibrational relaxation of c-C6F12 excited above the dissociation threshold |
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| Institution: | 1. Center for Molecular Biology and Genetic Engineering (CBMEG), State University of Campinas — UNICAMP, Campinas, Brazil;2. Department of Genetics, Evolution and Bioagents, State University of Campinas — UNICAMP, Campinas, Brazil;3. Institute Butantan, São Paulo, Brazil;4. Center of Natural and Human Sciences, Federal University of ABC, Santo André, Brazil;5. Department of Molecular Biology and Pharmacology, University of São Francisco, Bragança Paulista, Brazil |
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| Abstract: | The IR spectrum of c-C6F12 at a vibrational energy of twice the dissociation threshold was investigated. Absorption of cw CO2 laser radiation was measured at various frequencies. Our experimental conditions were chosen such that during absorption measurements all vibrational degrees of freedom were in equilibrium, the molecular rotation being at room temperature. The Boltzmann vibrational distribution allowed computer simulations of the spectrum to be made to determine the homogeneous contribution. The homogeneous half-width of the spectrum is γ=13±0.5 cm−1 and the homogeneous spectrum of c-C6F12 at E= 60000 cm−1 is non-Lorentzian. We attribute this to the influence of higher-order anharmonicities on the relaxation from the excited mode (v27) to other modes in the molecule. |
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