Volume 517, July 2010
|Number of page(s)||11|
|Section||Atomic, molecular, and nuclear data|
|Published online||26 July 2010|
Gas-phase infrared spectra of cationized nitrogen-substituted polycyclic aromatic hydrocarbons
FOM Institute for Plasma Physics “Rijnhuizen”,
Edisonbaan 14, 3439MN Nieuwegein, The Netherlands e-mail: H.AlvaroGalue@rijnhuizen.nl
2 Synchrotron SOLEIL, L'Orme des Merisiers Saint-Aubin, 91192 Gif-sur-Yvette Cedex, France e-mail: email@example.com
3 Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands e-mail: firstname.lastname@example.org
Accepted: 30 March 2010
Gas-phase infrared spectra of several ionized nitrogen substituted polycyclic aromatic hydrocarbons (PANHs) have been recorded in the 600–1600 cm-1 region via IR multiple-photon dissociation (IRMPD) spectroscopy. The UV photoionized PANH ions are trapped and isolated in a quadrupole ion trap where they are irradiated with an IR free electron laser. The PANHs were studied in their radical cation (PANH+) and protonated (H+PANH) forms, and include quinoline, isoquinoline, phenanthridine, benzo[h]quinoline, acridine, and dibenzo[f,h]quinoline. Experimental IRMPD spectra were interpreted with the aid of density functional theory methods. The PANH+ IR spectra are found to resemble those of their respective non-nitrogenated PAH cations. The IR spectra of H+PANHs are significantly different owing to the NH inplane bending vibration, which generally couples very well with the aromatic CH bending and CC stretching modes. Implications of the NPAH (+, H+) laboratory spectra are discussed for the astrophysical IR emissions and, in particular, for the band at 6.2 μm.
Key words: astrochemistry / methods: laboratory / techniques: spectroscopic / ISM: molecules / molecular processes
© ESO, 2010
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