Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...706l..66k&link_type=abstract
The Astrophysical Journal Letters, Volume 706, Issue 1, pp. L66-L70 (2009).
Astronomy and Astrophysics
Astronomy
20
Astrochemistry, Infrared: Ism, Ism: Molecules, Methods: Laboratory, Molecular Data, Techniques: Spectroscopic
Scientific paper
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.
Dopfer Otto
Knorke Harald
Langer Judith
Oomens Jos
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