Ethane and acetylene abundances in the Jovian atmosphere

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Abundance, Acetylene, Atmospheric Composition, Ethane, Jupiter Atmosphere, Molecular Spectra, Absorptivity, Atmospheric Models, Atmospheric Temperature, Data Reduction, Emission Spectra, Radiative Transfer, Temperature Inversions

Scientific paper

The paper reports spectra of Jupiter in the spectral region from 755 to 850 kaysers, which covers the nu-9 fundamental of ethane and contains lines from the R branch of the nu-5 fundamental of acetylene. The monochromatic absorption coefficient of the central Q branch of the nu-9 fundamental of ethane, which was determined in the laboratory, is applied in a radiative-transfer calculation to evaluate the ethane mixing ratio in the Jovian atmosphere; the present data are also used to place an upper limit on the acetylene mixing ratio. For the radiative-transfer calculation, emission intensity is computed for the region above the 0.02-atm level assuming both an isothermal inversion layer and a previously reported temperature profile. The resulting maximum mixing ratios consistent with the observations are 0.00003 for ethane and 7.5 by 10 to the -8th power for acetylene.

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