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Journal Article

Infrared Photodissociation Spectroscopy of the Benzoic Acid Radical Cation in a Quadrupole Trap

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Helden,  Gert von
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Meijer,  Gerard
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Oomens, J., Helden, G. v., & Meijer, G. (2004). Infrared Photodissociation Spectroscopy of the Benzoic Acid Radical Cation in a Quadrupole Trap. Journal of Physical Chemistry A, 108(40), 8273-8278. doi:10.1021/jp047532c.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-0B4D-1
Abstract
The vibrational spectrum of the gas-phase benzoic acid radical cation is reported in the fingerprint region from 500 to 1800 cm-1. The benzoic acid cation is produced either via (1 + 1') resonance-enhanced multiphoton ionization or via chemical ionization of benzoic acid vapor. The ions are stored and mass-selectively isolated in a quadrupole ion trap where they are irradiated with the output of a widely tunable infrared free electron laser. Upon resonance, photodissociation occurs and recording the total fragment-ion yield as a function of wavelength yields the infrared spectrum. The experimental spectrum suggests that the ion is effectively planar, although a density functional theory calculation predicts a staggered structure to be the lowest in energy. In addition, we tentatively identify the infrared spectrum of protonated benzoic acid.