Optical constants of Titan tholins at mid-infrared wavelengths (2.5-25 μm) and the possible chemical nature of Titan's haze particles

Details Optical constants of Titan tholins at mid-infrared wavelengths (2.5-25 μm) and the possible chemical nature of Titan's haze particles Optical constants of Titan tholins at mid-infrared wavelengths (2.5-25 μm) and the possible chemical nature of Titan's haze particles

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012icar..218..247i&link_type=abstract

Icarus, Volume 218, Issue 1, p. 247-261.

Computer Science

Scientific paper

Complex organic materials may exist as haze layers in the atmosphere of Titan and as dark coloring agents on icy satellite surfaces. Laboratory measurements of optical constants of plausible complex organic materials are necessary for quantitative evaluation from remote sensing observations, and to document the existence of complex organic materials in the extraterrestrial environments. The recent Cassini VIMS and CIRS observations provide new constraints on Titan's haze properties in the mid-infrared wavelength region. Here, we present the optical constants (2.5-25 μm) of Titan tholins generated with cold plasma irradiation of a N2/CH4 (90/10) gas mixture at pressures of 0.26 mbar, 1.6 mbar, and 23 mbar. Our new optical constants of three types of Titan tholins suggest that no single Titan tholin in this study fulfills all the observational constraints of the Titan haze material. The discrepancy remains a challenge for future modeling and laboratory efforts that aim toward a better understanding of Titan's haze material.

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