کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5426868 | 1395910 | 2006 | 8 صفحه PDF | دانلود رایگان |

We have investigated the interaction of molecular oxygen with the Ag(1Â 0Â 0) surface in a temperature range from 130Â K to 470Â K and an oxygen partial pressure ranging up to 10Â mbar by scanning tunneling microscopy, low electron energy diffraction, Auger electron spectroscopy and ab initio density functional calculations. We find that at 130Â K, following oxygen exposures of 6000Â Langmuirs O2, the individual oxygen atoms are randomly distributed on the surface. When the sample is exposed to 10Â mbar O2 at room temperature, small, p(2Â ÃÂ 2) reconstructed patches are formed on the surface. After oxidation at â470Â K and 10Â mbar O2 pressure the surface undergoes a c(4Â ÃÂ 6) reconstruction coexisting with a (6Â ÃÂ 6) superstructure. By ab initio thermodynamic calculations it is shown that the c(4Â ÃÂ 6) reconstruction is an oxygen adsorption induced superstructure which is thermodynamically stable for an intermediate range of oxygen chemical potential.
Journal: Surface Science - Volume 600, Issue 3, 1 February 2006, Pages 617-624