Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341l..21c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 341, June 1, 1989, p. L21-L24. Research supported by NSF.
Astronomy and Astrophysics
Astrophysics
35
Aromatic Compounds, Azulene, Cyclic Hydrocarbons, Infrared Spectra, Interstellar Chemistry, Ultraviolet Lasers, Absorption Spectra, Emission Spectra, Fluorescence, Interstellar Matter, Molecular Excitation, Pulsed Lasers
Scientific paper
The infrared fluorescence spectrum from the C-H stretch modes of vibrationally excited azulene (C10H8), a PAH was measured in the laboratory. PAHs are candidates as carriers of the unidentified infrared emission bands that are observed in many astronomical objects associated with dust and ultraviolet light. In the present experiment, gas phase azulene was excited with light from a 308 nm pulsed laser, and the infrared emission spectrum was time-resolved and wavelength-resolved. Moreover, the infrared absorption spectrum of gas phase azulene was obtained using an FTIR spectrometer. The laboratory emission spectrum resembles observed infrared emission spectra from the interstellar medium, providing support for the hypothesis that PAHs are the responsible carriers. The azulene C-H stretch emission spectrum is more asymmetric than the absorption spectrum, probably due to anharmonicity of levels higher than nu = 1.
Barker John R.
Cherchneff Isabelle
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