Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146...76v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 1, May 1985, p. 76-80. Research supported by the Stichting voor Funda
Astronomy and Astrophysics
Astrophysics
179
Cyclic Hydrocarbons, Diffuse Radiation, Interstellar Chemistry, Interstellar Extinction, Molecular Clouds, Molecular Spectra, Absorption Spectra, Aromatic Compounds, Free Radicals, Hydrogenation, Line Spectra, Positive Ions, Ultraviolet Absorption
Scientific paper
The authors discuss some of the thermodynamic and spectroscopic properties of polycyclic aromatic hydrocarbons which make them attractive candidates as carriers of the diffuse interstellar bands (DIB's). They point out that, in the diffuse medium, many of these species will be partially hydrogenated and positively charged and will absorb in the visible. The observed lineshapes and -widths of the DIB's can be explained by rovibronic band contours and linebroadening due to internal conversion. Since little information is available concerning the spectroscopic properties of such species in the gas phase, a considerable amount of laboratory and theoretical work is needed.
Allamandola Louis J.
van der Zwet G. P.
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