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OH-stretching overtone spectra of primary and secondary alcohols
Casper Vindahl Jensen1, Emil Vogt1, Pablo Bertran Valls1
1Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen-Ø, DK-2100, Denmark.
Abstract:
Absorption spectra of neopentyl alcohol and pinacolyl alcohol are recorded in the gas phase at room temperature and equilibrium conditions. A combination of conventional Fourier transform spectroscopy and cavity ringdown spectroscopy is used to cover the spectral OH-stretching regions, ΔvOH=1-5. The conformer distributions of the alcohols are determined from the recorded spectra combined with transition intensities calculated with a reduced dimensional local mode model. The distributions are in good agreement with theoretically obtained distributions. The recorded OH-stretching bands show classification-dependent similarities across different species. A resonant combination band is observed and assigned in the ΔvOH=5 region and is shown to be conformer specific. The generalization of observed spectral features can aid in assignment of alcohols from satellite and telescope measurements such as the James Webb Space Telescope.
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