Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380l..43f&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. L43-L46.
Astronomy and Astrophysics
Astrophysics
35
Absorption Spectroscopy, Aromatic Compounds, Hydrocarbons, Infrared Radiation, Interstellar Matter, Spectral Emission, Astronomical Spectroscopy, Cosmic Dust, Emission Spectra, Vapor Phases
Scientific paper
Results of absorption measurements indicate that the PAH species responsible for the UIR (unidentified infrared) emission probably exist in a condensed form rather than as isolated molecules. It is shown that the peak absorption of the C-H stretch feature of vapor-phase PAHs occurs at a higher frequency than that of the condensed-phase PAHs and does not match the 3.289-micron interstellar feature. The vapor-phase experiments duplicate the phenomenon of the 3.3-micron profile simplification of PAH in KBr at elevated temperature. This confirms that the change of the profile with temperature is an intrinsic molecular effect, and is not a consequence of matrix (KBr) or condensed state interactions.
Flickinger Gregory C.
Gomez Percy L.
Wdowiak Thomas J.
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