Infrared spectra of gaseous mononitriles - Application to the atmosphere of Titan

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atmospheric Composition, Infrared Spectra, Nitriles, Satellite Atmospheres, Titan, Acetonitrile, Acrylonitriles, Infrared Spectroscopy, Molecular Spectra, Vibrational Spectra, Saturn, Satellites, Titan, Infrared, Spectra, Atmosphere, Volatiles, Gases, Composition, Wavelengths, Absorption, Spectroscopy

Scientific paper

A list of volatile nitriles, not yet detected in the atmosphere of Titan, but likely to be present in this environment, has been selected: acetonitrile, propionitrile, acrylonitrile, crotononitrile, allyl cyanide, methacrylonitrile, and cyanopropyne. The spectra of these compounds in the gas phase have been systematically studied, in the mid- and far-infrared ranges. For each selected nitrile, the most intense vibration bands have been determined. Their strengths have been characterized by estimating the monochromatic absorption coefficient at the maximum(s) of the bands, and the integrated absorbance over the entire band. Then, in order to estimate the detectability of the selected compounds by infrared spectroscopy in the atmosphere of Titan, the data obtained have been extrapolated to the case of Titan.

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