Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.210g&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
UV processing of a hydrogenated amorphous carbon (HAC) may provide an interpretation of the interstellar UV bump at 4.6 μm-1 (217.5 nm) in the interstellar extinction curve. Mennella et al. (1996) had found that the UV irradiation of HAC materials has a strong effect creating a new absorption band which appears at 215 nm, attributing this band to %B i-%B i* electronic transitions in clusters of sp^2 hybridized carbon. We have irradiated HAC materials produced by laser ablation in H/He atmospheres with UV doses of up to 33% of the average interstellar dose. Structural investigation by electron microscopy reveals that these materials become more graphitic with UV irradiation. UV spectroscopy of the HACs shows that a stable UV bump appears at around 217 nm, which becomes stronger and narrower with increasing UV dose. The results are compared with the astronomical data of this band.
Gadallah K.
Jäger Cornelia
Mutschke Harald
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