Infrared Absorption Spectra of Deuterated Amorphous Carbon

Astronomy and Astrophysics – Astronomy

Scientific paper

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Ism: Lines And Bands, Ism: Molecules, Methods: Laboratory

Scientific paper

We report infrared absorption spectra of hydrogenated amorphous carbon (HAC) deposits prepared in the presence of deuterium. Spectra of D:HAC and DAC are characterized by the appearance of additional features near 2175 cm-1 (4.6 μm) corresponding to stretching vibrations of CDn groups. These are accompanied by a weakening of absorption in the CHn absorption bands throughout the infrared. Laboratory data suggest that it may be possible to detect deuterium fractionations XD/H>=7.4×10-3 in carbonaceous dust along the line of sight to Galactic center sources via absorption within the CDn stretching band near 4.6 μm.

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