STM STUDY OF FORMIC-ACID ADSORPTION ON CU(110)

We report a scanning tunneling microscopy (STM) study of formic acid a dsorption on clean Cu(110) at 300 K. An ordered structure was observed consisting of short rows parallel to the [110] direction, with an int er-row spacing in the [001] direction of two lattice spacings of the u nreconstructed (1 X 1)-Cu(110) termination. Adjacent domains of this s tructure were offset in the [001] direction by one lattice spacing giv ing relatively short-range order in the [110] direction. A structure i s proposed to account for the observed STM images.