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Adsorption of CO at the Sr$_3$Ru$_2$O$_7$(001) surface was studied withlow-temperature scanning tunneling microscopy (STM) and density functionaltheory. In situ cleaved single crystals terminate in an almost perfect SrOsurface. At 78 K, CO first populates impurities and then adsorbs above theapical surface O with a binding energy E$_\mathrm{ads}$=-0.7 eV. Above 100 K,this physisorbed CO replaces the surface O, forming a bent CO2 with the C endbound to the Ru underneath. The resulting metal carboxylate (Ru-COO) can bedesorbed by STM manipulation. A low activation (0.2 eV) and high binding (-2.2eV) energy confirm a strong reaction between CO and regular surface sites ofSr$_3$Ru$_2$O$_7$; likely, this reaction causes the "UHV aging effect" reportedfor this and other perovskite oxides.

High chemical activity of a perovskite surface: reaction of CO with Sr$_3$Ru$_2$O$_7$