Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..577c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. 577-584. Research supported by ASI, CNR, and MURST.
Astronomy and Astrophysics
Astrophysics
27
Aromatic Compounds, Cyclic Hydrocarbons, Infrared Spectra, Interstellar Matter, Infrared Absorption, Temperature Dependence
Scientific paper
The behavior of IR absorption bands with temperature has been examined systematically in the laboratory for three representative polycyclic aromatic hydrocarbon molecules: coronene, chrysene, and 1-methylcoronene. A careful description of both intensity and profile measured for most of the bands is reported. A tentative interpretation of the observed variations is given in terms of extra-molecular effects produced by the anharmonicity of the vibrational energy levels as a function of temperature. These new laboratory data provide an accurate description of the optical properties for representative molecules often used to account for the so-called unidentified infrared bands emitted by astronomical sources.
Bussoletti Ezio
Colangeli Luigi
Mennella Vito
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