Infrared Complex Refractive Index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory
Résumé
Several nitrogen-containing molecules have been unambiguously identified in the Solar System and in the
Interstellar Medium. It is believed that such a rich inventory of species is a result of the energetic processing
of astrophysical ices during the interaction with ionizing radiation. An intrinsic parameter of matter, the
complex refractive index, stores all the “chemical memory” triggered by energetic processing, and therefore
might be used to probe ice observations in the infrared. In this study, four N-containing ices have been condensed
in an ultra-high vacuum chamber and processed by heavy ions (O and Ni) with energies between
0.2 and 15.7MeV at the Grand Accélérateur National d’Ions Lourds (GANIL), in Caen, France. All chemical
changes were monitored in situ by Infrared Absorption Spectroscopy. The complex refractive index was calculated
directly from the absorbance spectrum, by using the Lambert-Beer and Kramers-Kroning relations,
and the values are available in an online database: https://www1.univap.br/gaa/nkabs-database/data.htm.
As a result, other than the database, it was observed that non-polar ices are more destroyed by sputtering
than polar ones. Such destruction and chemical evolution lead to variation in the IR albedo of samples
addressed in this paper.
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