Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..152b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 152-156. Research supported by MPI and CNR.
Astronomy and Astrophysics
Astrophysics
10
Cyclic Hydrocarbons, Hydrocarbons, Infrared Spectra, Interstellar Matter, Temperature Dependence, Abundance, Cosmic Dust, Optical Properties, Temperature Distribution
Scientific paper
The hypothesis that the optical properties of PAHs do not depend on temperature is tested by measuring the IR transmittance of coronene, chrysene, and 1-methylcoronene in the 300-520 K temperture range. The results demonstrate that all the bands whose intensities are considerably affected by temperature are commonly assigned to out-of-plane bending vibrations. The only exception is the 7.7 micron band, whose assignment is considered doubtful and is discussed in detail. This behavior is interpreted as arising from solid-state effects. The results will also be of use in understanding some open problems connected with the Unidentified Infrared Bands.
Blanco Ariel
Fonti Sergio
Orofino Vincenzo
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