Carbon dust structure and spectroscopy

Details Carbon dust structure and spectroscopy Carbon dust structure and spectroscopy

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..383m&link_type=abstract

The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb

Physics

1

Scientific paper

Laboratory studies aimed at probing structural and spectroscopic variations versus processing of carbon grains are of primary interest to better identify the properties and to outline an evolutionary pathway of these particles in the interstellar medium. Here we consider the UV spectral changes induced in hydrogenated carbon grains by thermal annealing, UV irradiation and ion bombardment. The results give the opportunity to propose a new interpretation of the UV interstellar extinction bump. In particular, modelling of the optical properties, based on a description of the electronic structure of carbons, indicates small hydrogenated amorphous carbon grains, with different degrees of UV irradiation, as the carrier of the ubiquitous interstellar feature.

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