Abstract
The formation of subsurface oxygen on a clean and sputtered Ru(0001) surface is studied using thermal desorption spectroscopy (TDS) and low energy electron diffraction (LEED). The oxygen was incorporated by exposing the surface to a partial oxygen pressure in the range of 10-8 -10-9 Torr. By monitoring the signal of recombinatively desorbed molecular oxygen as a function of sample temperature, we found that oxygen molecules penetrated into the subsurface region after saturating the adsorbed layer characterized by the p(2 × 2) LEED pattern indicative of 0.25 monolayers (1 ML = 1.58 × 1015 cm-2). In contrast, the defects generated by Ar+ sputtering on the Ru surface appear at thermally more stable sites in high-temperature O2 thermal desorption states.
Original language | English |
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Pages (from-to) | 408-412 |
Number of pages | 5 |
Journal | Journal of the Korean Physical Society |
Volume | 42 |
Issue number | 3 |
Publication status | Published - 2003 Mar |
Externally published | Yes |
Keywords
- Adsorption
- Oxygen
- Ru
- Subsurface
- Thermal desorption spectroscopy
ASJC Scopus subject areas
- Physics and Astronomy(all)