Giulia de Petris, Universita ’’La Sapienza’’, Roma, Italy, and colleagues have reported new experimental direct  measurements of the proton affinity and the gas-phase basicity of SO₂, at relatively high pressure and 298 K, using ion-trap mass spectrometry and the thermokinetic method of Bouchoux.

These gas-phase experiments and theoretical calculations revise significantly downward the proton affinity and gas-phase basicity of sulfur dioxide.

• The Proton Affinity and Gas-Phase Basicity of Sulfur Dioxide,
  Giulia de Petris, Antonella Cartoni, Marzio Rosi, Vincenzo Barone, Cristina Puzzarini, Anna Troiani,
  ChemPhysChem 2010.
  DOI: 10.1002/cphc.201000920