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Infrared spectra of isolated protonated polycyclic aromatic hydrocarbon molecules

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Author
Abstract

Gas-phase infrared (IR) spectra of larger protonated polycyclic aromatic hydrocarbon molecules, H(+)PAH, have been recorded for the first time. The ions are generated by electrospray ionization and spectroscopically assayed by IR multiple-photon dissociation (IRMPD) spectroscopy in a Fourier transform ion cyclotron resonance mass spectrometer using a free electron laser. IRMPD spectra of protonated anthracene, tetracene, pentacene, and coronene are presented and compared to calculated IR spectra. Comparison of the laboratory IR spectra to an astronomical spectrum of the unidentified IR emission (UIR) bands obtained in a highly ionized region of the interstellar medium provides for the first time compelling spectroscopic support for the recent hypothesis that H(+)PAHs contribute as carriers of the UIR bands.

Year of Publication
2009
Journal
Astrophysical Journal Letters
Volume
706
Number
1
Number of Pages
L66-L70
Date Published
Nov
Type of Article
Article
Accession Number
ISI:000271533200014
URL
PId
9ddc36f9ca1d9d437befe1fbebb9f7a6
Alternate Journal
Astrophys. J. Lett.
Journal Article
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