Other
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........13b&link_type=abstract
Thesis (PHD). UNIVERSITY OF ALABAMA AT BIRMINGHAM , Source DAI-B 58/05, p. 2468, Nov 1997, 108 pages.
Other
2
Plasma, Extinction
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 material having ultraviolet spectral characteristics suggesting that it is reasonable to consider it as a laboratory analog for the carrier of the 2175 A interstellar extinction feature. Ultraviolet, visible, infrared and mass spectroscopy along with gas chromatography indicates it to be a molecular aggregate in which an aromatic double-ring structure serves as a significant base for the electron 'box' chromophore that gives rise to the envelope of the 2175 A feature. It can also provide the peak of the feature or function in concert with another peak provider such as graphite. This base manifests itself both as a component of an alkyl-aromatic polymer and as a substructure of hydrogenated PAH species. Its spectral and molecular characteristics are consistent with what is expected for a material that has a role as an interstellar constituent. Other results of the research are the synthesis of a material having a spectral signature that correlates with the infrared emission of the proto-planetary nebula IRAS 05341+0852, and infrared spectroscopy and molecular modeling that suggests the observed strength of the interstellar 6.2 micron emission band is the signature of hydrogenated polycyclic aromatic hydrocarbons.
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