Protonated sulfuric acid: Vibrational signatures of the naked ion in the near- and Mid-IR

Rajeev K. Sinha, Barbara Chiavarino, Simonetta Fornarini, Joel Lemaire, Philippe Maitre, Maria Elisa Crestoni

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11 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1721-1724
Number of pages4
JournalJournal of Physical Chemistry Letters
Issue number11
Publication statusPublished - 03-06-2010

All Science Journal Classification (ASJC) codes

  • Materials Science(all)


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