D. I. Sayago, P. Serrano, O. Böhme, A. Goldoni, G. Paolucci, E. Román and J. A. Martín-Gago. Adsorption and desorption of SO2 on the TiO2(110)-(1 × 1) A photoemission study surface: A photoemission study. Physical Review B, 2001, 64: 2054021- 2054028.