Search for the 4430 A DIB in the spectra of coronene cation and neutral ovalene

Details Search for the 4430 A DIB in the spectra of coronene cation and neutral ovalene Search for the 4430 A DIB in the spectra of coronene cation and neutral ovalene

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..257e&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 1, p. 257-264.

Astronomy and Astrophysics

Astrophysics

43

Aromatic Compounds, Cyclic Hydrocarbons, Diffuse Radiation, Interstellar Matter, Stellar Coronas, Ultraviolet Spectra, Cations, Neutral Particles

Scientific paper

Polycyclic Aromatic Hydrocarbons (PAHs) have been proposed as candidates to explain the Diffuse Interstellar Bands (DIBs). Among the great variety of these species, two seemed of special interest: the coronene cation and neutral ovalene, because solution spectra reported in the literature show that they possess transitions near the strong 4430 A DIB. We have performed laboratory measurements, using rare gas matrix isolation techniques and UV photolysis to provide a data base with the spectra of these two species and their ions, almost free from environmental shifts and broadening. Bands are found at 4590 A for the coronene cation and 4305 A for neutral ovalene. The poor agreement of the visible spectra of the coronene cation and the neutral and ionized ovalene with current astronomical observations excludes these species as carriers of already known DIBs. Conversely, these laboratory data can be used to search for the presence of these two PAHs in the spectra of interstellar objects. We further discuss the possibility that other PAH molecules could be carriers of broad DIBs, considering the widths and strengths of measured bands for coronene and ovalene.

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