The time correlation between the electron dynamics and the ion dynamics on the dissociative adsorption of oxygen molecules on a platinum surface and a gold surface modeled by a cluster has been investigated using the Ehrenfest TDDFT molecular dynamics method. It is found that the electron transfer from the surface to O-2 occurs more easily on the Pt(0 0 1) surface than on the Au(0 0 1) surface, and that the transfer of one electron from Pt to O-2 is completed when the O-2 reaches similar to 1.6 angstrom from the Pt surface. (C) 2010 Elsevier B. V. All rights reserved.