Tholins produced by a RF plasma

Details Tholins produced by a RF plasma Tholins produced by a RF plasma

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..620a&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Biology

Scientific paper

Photochemistry by solar photons induces the formation of solid aerosols in the atmosphere of Titan. During the descent of the probe Huygens in 2005, a lot of data were collected. Among these data, the interesting ones for Titan's aerosols were produced by : i) the DISR experiment that provided optical data on the aerosols and on Titan's surface; ii) the ACP experiment, which provided compositional aerosols data [2]; iii) the HASI experiment [3] which measures the electrical properties of Titan's ground. Some properties of Titan's aerosols have been already deduced from Huygens data. However, a lot of data remains difficult to be interpreted without reference. These data do not allow to understand the formation of Titan's aerosols. Laboratory simulations of the chemical-physics of Titan's atmosphere are thus of primary interest. The equivalents of Titan's aerosols produced in laboratory are named tholins. Up to now, most of tholins are produced as films deposited on solid surfaces. They do not reproduce the fractal form of Titan's aerosols, and solid substrate can influence the chemistry. The SA team has started to produce analogues of Titan's aerosols in laboratory, using a Radio-Frequency (RF) Capacitively Coupled Plasma (CCP). This kind of plasma produces solid particles in the gas phase. It also allows producing sufficient amounts of tholins which can be provided to laboratories collaborating in the field of planetology/astrobiology. We present the correlations between the plasma conditions and tholins properties.

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