Physics of IR emission by interstellar PAH molecules

Details Physics of IR emission by interstellar PAH molecules Physics of IR emission by interstellar PAH molecules

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216..148l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 148-164.

Astronomy and Astrophysics

Astronomy

141

Astronomical Spectroscopy, Cyclic Hydrocarbons, Infrared Sources (Astronomy), Interstellar Matter, Absorption Spectra, Emission Spectra, Specific Heat, Vibrational Spectra

Scientific paper

The emission of IR photons by an isolated large PAH ion is investigated, and relationships are proposed to calculate emission spectra from absorption spectroscopical data. A simple thermal approximation is shown to be valid. A formula relating the vibrational temperature to the internal energy content of the species is used to determine the specific heat of a large PAH molecule. The results suggest that PAH ions are a major component of interstellar matter, and that they are compact ionized molecules with substantial dehydrogenation. The mean temperature during the hot impulse of species emission in the 3-11-micron range is found to be 500-700 K. Band position, width, and strength values for a model PAH are given.

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