Single-photon infrared emission spectroscopy of gaseous polycyclic aromatic hydrocarbon cations: A direct test for proposed carriers of the unidentified infrared emission bands

Hack Sung Kim*, Richard J. Saykally

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

We describe the measurement of infrared emission from excited gas-phase polycyclic aromatic hydrocarbons (PAHs) cations by an electron-impact ion beam reflection 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 (C16H 10+) and the dehydrogenated pyrene cations (C 16H8+ 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+.

Original languageEnglish (US)
Pages (from-to)455-467
Number of pages13
JournalAstrophysical Journal, Supplement Series
Volume143
Issue number2
DOIs
StatePublished - Dec 2002

Keywords

  • Dust: extinction
  • ISM: lines and bands
  • Infrared: ISM
  • Methods: laboratory
  • Techniques: spectroscopic
  • molecular data

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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