Div. of Synchrotron Radiation Research

SLF
MAX-lab
Research
Exjobb
Seminars
Staff
Publications
Links
Intranet
Download
Secureweb
Teaching

H. Over, A.P. Seitsonen, E. Lundgren, M. Schmid and P. Varga
Experimental and simulated STM images of stoichiometric and partially reduced RuO2(110) surfaces including adsorbates.
Surf. Sci. 515 (2002) 143.

Abstract
We present experimental and DFT-simulated STM images of ultrathin RuO2(1 1 0) films on Ru(0 0 0 1), including adsorbates such as oxygen and CO. We are able to identify the under-coordinated O atoms on the RuO2(1 1 0) surface with STM, i.e. the bridging O atoms and the on-top O atoms. The partial reduction of the RuO2(1 1 0) surface by CO exposure at room temperature leads to a surface where part of the bridging O atoms have been removed and some of the vacancies are occupied by bridging CO. When dosing 10 L of CO at room temperature, the RuO2(1 1 0) surface becomes fully mildly reduced in that all bridging O atoms are replaced by bridging CO molecules. Annealing the surface to 600 K produces holes on the terraces of such a mildly reduced RuO2(1 1 0) surface. These pits are not generated by the recombination of lattice O with CO, but rather these pits are assigned to a complex temperature-induced rearrangement of surface atoms in the topmost RuO2 double layer of RuO2(1 1 0). With this process the bridging O atoms are again populated and surplus Ru atoms agglomerate in small islands at the rims of the holes.

Link to the complete paper (if available):


Lunds universitet, Avdelningen för synkrotronljusfysik
Besöks- och leveransadress: Sölvegatan 14, 223 62 Lund
Postadress: Box 118, 221 00 Lund
Fakturaadress: Box 188, 221 00 Lund
OBS! Beställarens för- och efternamn måste alltid anges som referens på fakturan!

Lund University, Division of Synchrotron Radiation Research
Visiting and delivery address: Sölvegatan 14, 223 62 Lund, Sweden
Mail address: Box 118, 221 00 Lund, Sweden
Billing address: Box 188, 221 00 Lund, Sweden
Please observe that all bills have to contain the orderer's first and last name as the reference.

Phone: +46 (0)46-222 00 00, Fax: +46 (0)46-222 42 21
Webmaster: Johan Gustafson