Infrared frequencies and intensities for astrophysically important polycyclic aromatic hydrocarbon cations

Details Infrared frequencies and intensities for astrophysically important polycyclic aromatic hydrocarbon cations Infrared frequencies and intensities for astrophysically important polycyclic aromatic hydrocarbon cations

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..646s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 646-655.

Astronomy and Astrophysics

Astrophysics

72

Aromatic Compounds, Cations, Cyclic Hydrocarbons, Interstellar Matter, Line Spectra, Molecular Ions, Molecular Spectra, Emission Spectra, Infrared Spectra, Interstellar Chemistry, Spectral Bands, Spectral Energy Distribution

Scientific paper

Polycyclic aromatic hydrocarbons (PAHs) have been implicated as the carriers of the 'unidentified infrared' (UIR) emission bands observed from the interstellar medium. It has long been thought that these molecules, if present, probably exist as cations. In this paper we present infrared spectra of the cations of five moderate-sized PAHs. The PAH cations have been produced by low-energy electron impact and then trapped and stabilized in argon matrices at 12 K. To date, results have been obtained on naphthalene, anthracene, pyrene, perylene, and coronene. A common feature of the infrared spectra of all these cations is the very different intensity pattern of the ions compared to the neutral parents. Visible and (partial) infrared spectra of the coronene cation are also presented. It is shown that the out-of-plane CH bending mode shifts to a position very close to the UIR band at 11.3 microns. The astrophysical impact of these observations is discussed.

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