journal menu
![[Figure 2]](ve5010fig2mag.jpg)
|
|
Figure 2
Left-hand panel: the lower part represents the time evolution of the CO (filled symbols) and C (open symbols) XPS peak intensities (with photon energy 630 eV). The measured peak areas were normalized such that the CO saturation coverage at RT corresponds to 0.5 ML. The figure shows corresponding experiments at RT [grey symbols (red online)] and at LN temperature [black symbols (blue online)]. The upper part shows mass spectrometer measurements of the partial pressures at LN temperature. A CO partial pressure of 0.9 × 10−8 mbar is introduced into the chamber at t = 0 s. 15 min after, O2 partial pressure of 4.9 × 10−8 mbar has been introduced. In both experiments the surface is exposed to CO and O2 with a partial pressure ratio P(O2)/P(CO) = 5. After 285 min the O2 partial pressure is switched off. Right-hand panel: contaminated surfaces resulting from the previous experiment are exposed again to a mixture of CO and O2 with a partial pressure ratio P(O2)/P(CO) = 5. |
![[Figure 2]](ve5010fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
