Abstract

A high-resolution 2.9-3.5 μm spectrum of Titan has revealed a surprisingly strong emission band of hydrogen cyanide (HCN) and strong absorption bands of acetylene (C2H2) and monodeuterated methane (CH3D), in addition to methane (CH4) emission and absorption known from previous observations. Whereas the C2H2 and CH3D absorptions are largely in the troposphere, the HCN emission must occur at higher altitudes. However, the intensity of the HCN band is inconsistent with our current understanding of the upper atmosphere of Titan.

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