ELS VIBRATIONAL STUDY OF CARBON-MONOXIDE ADSORBED ON THE CU(110) SURFACE

The adsorbate site location for CO on Cu(110) has been investigated with electron energy loss vibrational spectroscopy. With low coverage at 80 K vibrational energies of 85 and 258 meV are observed. At high coverages and/or near the thermal desorption temperature of 170 K, only a single peak at 260 meV is observed. A simple spring model analysis of the vibrational energies indicates that a bridge position is occupied by CO in the first case and the on-top position in the second case although LEED results indicate that CO cannot be highly localized at any one site in the high coverage case.