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NAI Titan Meeting Jul 7-8 2009

Research background and Theme Yung’s group. Photochemistry + transport Tholin formation Isotopic fractionation and Evolution. NAI Titan Meeting Jul 7-8 2009.

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NAI Titan Meeting Jul 7-8 2009

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  1. Research background and Theme Yung’s group Photochemistry + transport Tholin formation Isotopic fractionation and Evolution NAI Titan Meeting Jul 7-8 2009

  2. * A new adjoint model was developed and applied to this problem of extremely complex and likely missing hydrocarbon chemistry that allowed optimization of all the reaction rate coefficients in a given kinetics scheme all at once or, as we also computed, for all chemistry involving C3 or higher hydrocarbons, • * and in a manner 100 times more efficient than optimization of individual rate coefficients could proceed. • * Unrealistic rate coefficients objective evidence that missing chemistry is likely important, both in laboratory measurements and in planetary atmospheres.

  3. Photochemical results HCN CH4; hydrostatic HC3N CH4; non-hydrostatic C6N2 C6H6 C6N2; condensation line Liang, Yung, Shemansky ApJ 2007

  4. tholin CH4 UVIS spectrum Impact: 514 km Liang et al. 2007

  5. Personnel:Yuk YungMark AllenRunlie Shia Mike Line, Arthur Zhang

  6. Backup slides

  7. Synergistic Study of Hydrocarbon Photochemistry in the Laboratory and Planetary Atmospheres Mao-Chang Lianga,b,*, Daven Henzec, Mate Adamkovicsd, Emily F. Chue, Kristie A. Boeringe,f, and Yuk L. Yungg PSS, in Review, 2009

  8. Chemical Dynamics of Triacetylene Formation and Implications for the Synthesis of Polyynes in Titan’s Atmosphere X. Gu, Y.S. Kim, R.I. Kaiser* Department of Chemistry, University of Hawaii at Manoa, Honolulu, HI A.M. Mebel Department of Chemistry and Biochemistry, Florida International University, Miami FL M.C. Liang Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan Graduate Institute of Astronomy, National Central University, Jhongli, Taiwan Y.L. Yung/ PNAS in Review 2009 Division of Geological and Planetary Sciences, Caltech, Pasadena, CA

  9. Exotic Cyanoethynyl Radicals Provide Key to the Organic Haze on Titan Xibin Gu, Ralf I. Kaiser, Alexander M. Mebel, Vadim V. Kislov, Stephen J. Klippenstein, Lawrence B. Harding, Mao Chang Liang, Yuk L. Yung/ ApJ 699, 1-7, 2009, doi:10.1088/004-637X/699/1/1

  10. Isotopic fractionation of trace molecules in the atmosphere of TitanMao-Chang Liang1,2* and Yuk L. Yung31Research Center for Environmental Changes, Academia Sinica, Taiwan2Graduate Institute of Astronomy, National Central University, Taiwan3Division of Geological and Planetary Sciences, California Institute of Technology, USAAjJ, in Review, 2009.

  11. Photochemistry + transport • Tholin formation • Isotopic fractionation and Evolution

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