Possible assignment of the 11.3-micron UIR feature to emission from carbonaceous microparticles with internal hydrogens

Details Possible assignment of the 11.3-micron UIR feature to emission from carbonaceous microparticles with internal hydrogens Possible assignment of the 11.3-micron UIR feature to emission from carbonaceous microparticles with internal hydrogens

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..193b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 245, July 15, 1990, p. 193-197. Research supported by S

Astronomy and Astrophysics

Astronomy

6

Aromatic Compounds, Cyclic Hydrocarbons, Infrared Spectra, Microparticles, Red Giant Stars, Spectral Bands, Carbonaceous Materials, Emission Spectra, Planetary Nebulae, Spectrum Analysis

Scientific paper

The carriers of the unidentified IR bands seen in many Galactic and extragalactic objects have peviously been assigned to emission from polycyclic aromatic hydrocarbons (PAHs). However, the match between laboratory spectra of typical PAHs with the interstellar features in the structurally sensitive 11-15-micron region remains unsatisfactory. In particular, it has been difficult to explain, considering that a PAH mixture is undoubtedly involved, why only one strong band is seen at 11.3 microns and why this has the same position in all sources. Here, the possibility is discussed that a hitherto unrecognized class of molecule containing a novel type of hydrogen functional group, the internal hydrogen, may provide important new clues to the origin of the 11.3-micron feature. This type of grouping is typified by the molecule kekulene which contains six such internal hydrogens and exhibits bands in its IR absorption spectrum which coincide with the interstellar feature.

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