The peak at ca. 140 K corresponds to desorption of
the more weakly bound state.
The peak at ca. 140 K corresponds to desorption of
the more weakly bound state.
Rationale
| The more weakly bound state has the lower activation energy for desorption and will therefore undergo desorption at a lower temperature. The two peaks correspond to the presence of both molecularly and atomically (i.e. dissociatively) adsorbed oxygen on the surface. The molecular species is the more weakly adsorbed. |  |
