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

► Laboratory analogs of Titan aerosols are generated with cold plasma irradiation. ► The optical constants of Titan aerosol analogs at mid-IR wavelengths are tabulated. ► Discrepancy with recent Cassini observations of Titan haze remains to be answered.