Gas Phase Infrared Spectroscopy of Cationic Indane, Acenaphthene, Fluorene, and 
Fluoranthene

Oomens, Jos; Meijer, Gerard; von Helden, Gert

doi:10.1021/jp0110455

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Gas Phase Infrared Spectroscopy of Cationic Indane, Acenaphthene, Fluorene, and Fluoranthene

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Oomens, J., Meijer, G., & von Helden, G. (2001). Gas Phase Infrared Spectroscopy of Cationic Indane, Acenaphthene, Fluorene, and Fluoranthene. The Journal of Physical Chemistry A, 105(36), 8302-8309. doi:10.1021/jp0110455.

Cite as: https://hdl.handle.net/21.11116/0000-000B-6541-A

Abstract

Experimental gas phase infrared spectra are presented for four cationic polyaromatic hydrocarbons (PAHs) incorporating a five-membered ring, indane, acenaphthene, fluorene, and fluoranthene. The ions are stored in a quadrupole ion trap and irradiated with the intense narrow-band infrared light of a free electron laser (FEL). When the wavelength is in resonance with an allowed infrared transition in the ion, multiphoton absorption occurs, resulting in dissociation. Recording the fragment ion yield as a function of FEL wavelength gives a background-free infrared spectrum of the parent ion species. Experimental spectra are found to be in good overall agreement with density functional calculations, except for those for the fluoranthene cation.