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Accueil du site > Production scientifique > Protonated Sulfuric Acid : Vibrational Signatures of the Naked Ion in the Near- and Mid-IR

Protonated Sulfuric Acid : Vibrational Signatures of the Naked Ion in the Near- and Mid-IR

Date de publication: 17 mai 2010

R. K. Sinha, B. Chiavarino, S. Fornarini, J. Lemaire, P. Maitre, M. E. Crestoni
J. Phys. Chem. Lett. 1 (11) 1721–1724 (2010). DOI

Travail réalisé sur le site de l’Université Paris-Sud.

Abstract

The species formally obtained from the protonation of sulfuric acid is examined as a naked ion in the gas phase, and its IR spectral features are reported. The major fundamental vibrational bands have been acquired in both the 700−1700 and the 3400−3800 cm−1 spectral ranges using state of the art equipment at the CLIO facility, namely, FT-ICR mass spectrometry coupled to the tunable IR beam of either a free electron laser or a tabletop optical parametric oscillator/amplifier (OPO/OPA) laser source. In this way, the structural features of the sampled ion could be ascertained and found to conform to the most stable isomer on the [H3,S,O4]+ potential energy surface. The experimental IR multiple photon dissociation (IRMPD) spectrum is in fact consistent with the IR spectrum calculated for the trihydroxyoxosulfonium cation OS(OH)3+, providing a conclusive structural probe.