Journal ArticleDOI
Photoelectric Charging of Submicron Aerosols and Macromolecules in the Titan Haze
TLDR
In this article, the authors quantify the charge states of submicrometer aerosols and aromatic macromolecules in Titan's organic haze and show that during the day, the dominant charge state for submicro-meter aerosols is positive.About:
This article is published in Icarus.The article was published on 2002-06-01. It has received 31 citations till now. The article focuses on the topics: Aerosol & Haze.read more
Citations
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Journal ArticleDOI
Laboratory experiments of Titan tholin formed in cold plasma at various pressures: implications for nitrogen-containing polycyclic aromatic compounds in Titan haze
Hiroshi Imanaka,Hiroshi Imanaka,Bishun N. Khare,Jamie E. Elsila,E. L. O. Bakes,Christopher P. McKay,Dale P. Cruikshank,Seiji Sugita,Takafumi Matsui,Richard N. Zare +9 more
Journal ArticleDOI
Negative ion chemistry in Titan's upper atmosphere
Véronique Vuitton,Véronique Vuitton,Panayotis Lavvas,Roger V. Yelle,Marina Galand,Anne Wellbrock,Gethyn R. Lewis,Andrew J. Coates,Jan-Erik Wahlund +8 more
TL;DR: In this article, the authors present the first ionospheric model of Titan including negative ion chemistry and find that dissociative electron attachment to neutral molecules (mostly HCN) initiates the formation of negative ions.
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PAMPRE: A dusty plasma experiment for Titan's tholins production and study
TL;DR: In this article, a capacitively coupled radio-frequency (RF) cold plasma system at low pressure in a N2-CH4 gaseous mixture was used to simulate the atmospheric chemistry and produce analogues of Titan's aerosols.
Journal ArticleDOI
Negative Ions in Space
TL;DR: A number of processes by which anions can be created and destroyed in these environments are discussed, along with their successes and failings, and an outlook on the future.
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Titan's vertical aerosol structure at the Huygens landing site: Constraints on particle size, density, charge, and refractive index
TL;DR: Tomasko et al. as discussed by the authors presented a one dimension simulation of Titan's aerosol distribution and compared their results with the haze optical properties retrieved by the DISR observations, and derived a new refractive index for the aerosols based on the single scattering albedo inferred from DISR measurements.
References
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Photodissociation regions. I - Basic model. II - A model for the Orion photodissociation region
TL;DR: In this article, a theoretical parameter study of the temperature and chemical structure of dense photodissociation regions and their resultant spectrum is presented, which is relevant not only to the dust and gas between molecular clouds and H II regions, but also apply to any neutral cloud illuminated by intense FUV fluxes.
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Interstellar polycyclic aromatic hydrocarbons: the infrared emission bands, the excitation/emission mechanism, and the astrophysical implications.
TL;DR: The spectroscopic structure these PAHs and PAH-related materials produce in the UV portion of the interstellar extinction curve lie just below current detection limits but fall in the range detectable by the Hubble Space Telescope.
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Photochemistry of the atmosphere of Titan: comparison between model and observations.
TL;DR: The photochemistry of simple molecules containing carbon, hydrogen, nitrogen, and oxygen atoms in the atmosphere of Titan has been investigated using updated chemical schemes and the authors' own estimates of a number of key rate coefficients, which satisfactorily accounts for the concentrations of minor species observed by the Voyager IRIS and UVS instruments.
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The photoelectric heating mechanism for very small graphitic grains and polycyclic aromatic hydrocarbons
TL;DR: In this article, the authors considered a wide range of physical conditions for the interstellar gas and determined the net photoelectric heating rate and evaluated a simple analytical expression for the heating efficiency, dependent only on G(sub 0), T, and n(sub e).
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Optical constants of organic tholins produced in a simulated Titanian atmosphere: From soft x-ray to microwave frequencies
TL;DR: In this paper, the real and imaginary parts of the complex refractive index of thin films of the dark reddish organic solids called tholins, produced by continuous D.C. discharge through a 0.9 N2/0.1 CH4 gas mixture at 0.2 mb, were determined from a combination of transmittance, specular reflectance, interferometric, Brewster angle, and ellipsometric polarization measurements.