IR spectra of irradiated organic materials

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Infrared Spectroscopy, Interstellar Matter, Ion Irradiation, Molecular Structure, Organic Materials, Amorphous Materials, Astrophysics

Scientific paper

Infrared spectra of organic molecules, including frozen gases, aliphatic and aromatic polymers, complex molecules, and biological compounds are presented, and their changes due to fast ion bombardment are described. It is found that (1) the targets lose hydrogen preferentially and the stoichiometric H/C decreases; (2) the materials become more absorbing and their color changes from white to black as the ion dose increases; (3) the crystallinity, if present initially, is destroyed, and bombarded material is amorphous although microcrystallinity cannot be ruled out; (4) the skeletal vibrations are changed, indicating the occurrence of cross-lining and the formation of tridimensional networks. The astrophysical and space mission implications of these findings are addressed.

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