Titan's aerosols I. Laboratory investigations of shapes, size distributions, and aggregation of particles produced by UV photolysis of model Titan atmospheres

Thomas W. Scattergood, Edmond Y Lau, Bradley M. Stone

Research output: Contribution to journalArticle

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Abstract

Titan's aerosols are believed to have significant effects on the physical and radiative properties of its atmosphere. To investigate the physical properties of model Titan aerosols, experiments in which acetylene, ethylene, and hydrogen cyanide were photolyzed separately and as a mixture by ultraviolet light have been performed. In general, the individual particles formed were spherical, apparently amorphous, and quite sticky. When 1 Torr of C2H2 (in 55 Torr N2) was photolyzed, the average diameter of the individual particles was about 0.6 μm and most (≈ 4 5) of the particles were found in nonspherical near-linear aggregates. The mean diameter of the particles decreased to 0.4 μm for 0.1 Torr C2H2 and increased to 0.8 μm for 10 Torr C2H2. Aerosols formed from photolysis of C2H4 were physically similar to those formed from C2H2. Photolysis of HCN rapidly produced particles that apparently did not grow to sizes (>0.09 μm) large enough to be collected and imaged. The formation of particles from acetylene was observed within minutes in our experiments, but was slowed by about a factor of 4 when ethylene and hydrogen cyanide were added.

Original languageEnglish (US)
Pages (from-to)98-105
Number of pages8
JournalIcarus
Volume99
Issue number1
DOIs
StatePublished - 1992
Externally publishedYes

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Titan atmosphere
Titan
photolysis
aerosols
aerosol
atmosphere
succinonitrile
hydrocyanic acid
acetylene
cyanide
ethylene
physical properties
hydrogen
cyanides
ultraviolet radiation
laboratory
particle
physical property
experiment
atmospheres

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Titan's aerosols I. Laboratory investigations of shapes, size distributions, and aggregation of particles produced by UV photolysis of model Titan atmospheres. / Scattergood, Thomas W.; Lau, Edmond Y; Stone, Bradley M.

In: Icarus, Vol. 99, No. 1, 1992, p. 98-105.

Research output: Contribution to journalArticle

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AB - Titan's aerosols are believed to have significant effects on the physical and radiative properties of its atmosphere. To investigate the physical properties of model Titan aerosols, experiments in which acetylene, ethylene, and hydrogen cyanide were photolyzed separately and as a mixture by ultraviolet light have been performed. In general, the individual particles formed were spherical, apparently amorphous, and quite sticky. When 1 Torr of C2H2 (in 55 Torr N2) was photolyzed, the average diameter of the individual particles was about 0.6 μm and most (≈ 4 5) of the particles were found in nonspherical near-linear aggregates. The mean diameter of the particles decreased to 0.4 μm for 0.1 Torr C2H2 and increased to 0.8 μm for 10 Torr C2H2. Aerosols formed from photolysis of C2H4 were physically similar to those formed from C2H2. Photolysis of HCN rapidly produced particles that apparently did not grow to sizes (>0.09 μm) large enough to be collected and imaged. The formation of particles from acetylene was observed within minutes in our experiments, but was slowed by about a factor of 4 when ethylene and hydrogen cyanide were added.

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