Experimental Indication of a Naphthalene-Base Molecular Aggregate for the Carrier of the 2175 Angstrom Interstellar Exinction Feature

Details Experimental Indication of a Naphthalene-Base Molecular Aggregate for the Carrier of the 2175 Angstrom Interstellar Exinction Feature Experimental Indication of a Naphthalene-Base Molecular Aggregate for the Carrier of the 2175 Angstrom Interstellar Exinction Feature

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...487..976b&link_type=abstract

Astrophysical Journal v.487, p.976

Astronomy and Astrophysics

Astronomy

20

Ism: Dust, Extinction, Infrared: Ism: Lines And Bands, Ism: Molecules, Methods: Laboratory, Molecular Processes, Ultraviolet: Ism

Scientific paper

Experiments where the simple polycyclic aromatic hydrocarbon (PAH) naphthalene (C10H8) is subjected to the energetic environment of a plasma have resulted in the synthesis of a molecular aggregate that has ultraviolet spectral characteristics that suggest it provides insight into the nature of the carrier of the 2175 A interstellar extinction feature and may be a laboratory analog. Ultraviolet, visible, infrared, and mass spectroscopy, along with gas chromatography, indicate that it is a molecular aggregate in which an aromatic double ring ("naphthalene") structural base serves as the electron "box" chromophore that gives rise to the envelope of the 2175 A feature. This chromophore can also provide the peak of the feature or function as a mantle in concert with another peak provider such as graphite. The molecular base/chromophore manifests itself both as a structural component of an alkyl-aromatic polymer and as a substructure of hydrogenated PAH species. Its spectral and molecular characteristics are consistent with what is generally expected for a complex molecular aggregate that has a role as an interstellar constituent.

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