A (-Cu-O-) string on a Ag(110) surface defined by scanning tunneling microscopy (STM) was studied using the x-ray photoelectron spectroscopy (XPS), high resolution electron energy loss spectroscopy (HREELS). These data give the information about bonding properties which cannot be derived from the STM images. The combinative studies could show the structure as well as the growth mechanism of (-Cu-O-) strings on the Ag(110) surface. Deposition of Cu atoms on a p(2×1)-O Ag(110) surface resulted in a new O(1s) peak at 529.9 eV in the XPS and a new electron energy loss peak at 35 meV in the HREELS. These new peaks are assignable to the (Cu-O) bonding state on Ag(110), which is corresponding to the growth of new (-Cu-O-) strings in the  direction shown by the STM. These results suggest a stoichiometric reaction producing (-Cu-O-) strings according to an equation of (-Ag-O-)+Cu→(Cu-O-)+Ag on the Ag(110) surface. The fact that the Ag atoms released by the chemical reaction make layered Ag islands and the (-Cu-O-) strings also grow on the Ag islands in the  direction is indicative that the reaction proceeds perfectly in stoichiometric manner over the terrace.
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