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|Title:||Chromophores from photolyzed ammonia reacting with acetylene: Application to Jupiter's Great Red Spot||Authors:||Carlson, R. W.
Baines, K. H.
Anderson, M. S.
Simon, A. A.
|Issue Date:||2016||Journal:||ICARUS||Number:||274||First Page:||106||Abstract:||The high altitude of Jupiter's Great Red Spot (GRS) may enhance the upward flux of gaseous ammonia (NH<SUB>3</SUB>) into the high troposphere, where NH<SUB>3</SUB> molecules can be photodissociated and initiate a chain of chemical reactions with downwelling acetylene molecules (C<SUB>2</SUB>H<SUB>2</SUB>). These reactions, experimentally studied earlier by (Ferris and Ishikawa  Nature 326, 777-778) and (Ferris and Ishikawa  J. Amer. Chem. Soc. 110, 4306-4312), produce chromophores that absorb in the visible and ultraviolet regions. In this work we photolyzed mixtures of NH<SUB>3</SUB> and C<SUB>2</SUB>H<SUB>2</SUB> using ultraviolet radiation with a wavelength of 214 nm and measured the spectral transmission of the deposited films in the visible region (400-740 nm). From these transmission data we estimated the imaginary indices of refraction. Assuming that ammonia grains at the top of the GRS clouds are coated with this material, we performed layered sphere and radiative transfer calculations to predict GRS reflection spectra. Comparison of those results with observed and previously unreported Cassini visible spectra and with true-color images of the GRS show that the unknown GRS chromophore is spectrally consistent with the coupled NH<SUB>3</SUB>-C<SUB>2</SUB>H<SUB>2</SUB> photochemical products produced in our laboratory experiments. Using high-resolution mass spectrometry and infrared spectroscopy we infer that the chromophore-containing residue is composed of aliphatic azine, azo, and diazo compounds. <P />||URI:||http://hdl.handle.net/20.500.12386/24721||URL:||https://www.sciencedirect.com/science/article/abs/pii/S0019103516001494?via%3Dihub||ISSN:||0019-1035||DOI:||10.1016/j.icarus.2016.03.008||Bibcode ADS:||2016Icar..274..106C||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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|GRS Icarus Revision 07 Jan 2016.pdf||postprint||666.17 kB||Adobe PDF||View/Open|
|Carlson_etal_Icarus_2016.pdf||[administrators only]||1.74 MB||Adobe PDF|
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