[en] Full text: Measurements of electron, photon or ion yields as a function of photon energy in the region of inner-shell thresholds have long been known and used as a powerful probe of molecular spectroscopy, symmetry and photoionization dynamics. Anion spectroscopy constitutes a highly selective probe, yielding information unobtainable with absorption or electron spectroscopy, resulting in new experimental insights on resonant and non-resonant core-level processes. Here we present the cation and anion partial yields following photofragmentation of SO₂ near the sulphur L_2,3 ionization thresholds. The measurements were obtained using synchrotron radiation on undulator beamline 8.0.3 at the Advanced Light Source. Several cation fragments with the same mass/charge ratio could be observed by taking advantage of the ³⁴S isotope. Comparison is made to the absolute photoabsorption oscillator strengths of Feng et al. The S^-yield as a function of photon energy shows strong enhancement on the below threshold resonances with a broad weak peak above threshold corresponding to the doubly excited resonances