Single-Photon Infrared Emission Spectroscopy of Gaseous Polycyclic Aromatic Hydrocarbon Cations: A Direct Test for Proposed Carriers of the Unidentified Infrared Emission Bands

Details Single-Photon Infrared Emission Spectroscopy of Gaseous Polycyclic Aromatic Hydrocarbon Cations: A Direct Test for Proposed Carriers of the Unidentified Infrared Emission Bands Single-Photon Infrared Emission Spectroscopy of Gaseous Polycyclic Aromatic Hydrocarbon Cations: A Direct Test for Proposed Carriers of the Unidentified Infrared Emission Bands

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apjs..143..455k&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 143, Issue 2, pp. 455-467.

Astronomy and Astrophysics

Astronomy

24

Dust: Extinction, Infrared: Ism, Ism: Lines And Bands, Methods: Laboratory, Molecular Data, Techniques: Spectroscopic

Scientific paper

We describe the measurement of infrared emission from excited gas-phase polycyclic aromatic hydrocarbons (PAHs) cations by an electron-impact ion beam reflectron system coupled to our ``single-photon infrared emission'' (SPIRE) spectrometer. This experiment provides for direct comparison of laboratory infrared emission spectra of gaseous ionized PAHs with the ``unidentified infrared emission bands'' (UIRs), the origin of which is still debated. We present results for the pyrene cation (C16H10+) and the dehydrogenated pyrene cations (C16H8+ and C16H6+) showing general agreement between the corresponding SPIRE bands and UIR features, although it is not a detailed match. We also discuss possible contributions from the pyrene dimer cation (C16H10)2+.

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