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@comment{{Command line: bib2bib --quiet -c year=2002 -c $type="ARTICLE" -oc pub2002.txt -ob pub2002.bib}}
  author = {{Lebonnois}, S. and {Bakes}, E.~L.~O. and {McKay}, C.~P.},
  title = {{Transition from Gaseous Compounds to Aerosols in Titan's Atmosphere}},
  journal = {\icarus},
  year = 2002,
  volume = 159,
  pages = {505-517},
  abstract = {{We investigate the chemical transition of simple molecules like C
$_{2}$H $_{2}$ and HCN into aerosol particles in the context
of Titan's atmosphere. Experiments that synthesize analogs (tholins) for
these aerosols can help illuminate and constrain these polymerization
mechanisms. Using information available from these experiments, we
suggest chemical pathways that can link simple molecules to
macromolecules, which will be the precursors to aerosol particles:
polymers of acetylene and cyanoacetylene, polycyclic aromatics, polymers
of HCN and other nitriles, and polyynes. Although our goal here is not
to build a detailed kinetic model for this transition, we propose
parameterizations to estimate the production rates of these
macromolecules, their C/N and C/H ratios, and the loss of parent
molecules (C $_{2}$H $_{2}$, HCN, HC $_{3}$N and other
nitriles, and C $_{6}$H $_{6}$) from the gas phase to the
haze. We use a one-dimensional photochemical model of Titan's atmosphere
to estimate the formation rate of precursor macromolecules. We find a
production zone slightly lower than 200 km altitude with a total
production rate of 4{\times}10 $^{-14}$ g cm $^{-2}$ s
$^{-1}$ and a C/N{\sime}4. These results are compared with
experimental data, and to microphysical model requirements. The
Cassini/Huygens mission will bring a detailed picture of the haze
distribution and properties, which will be a great challenge for our
understanding of these chemical processes.
  doi = {10.1006/icar.2002.6943},
  adsurl = {},
  localpdf = {REF/2002Icar..159..505L.pdf},
  adsnote = {Provided by the SAO/NASA Astrophysics Data System}