PHOTOEMISSION-STUDY OF CARBON-MONOXIDE ON PT(001) USING POHANG SYNCHROTRON LIGHT-SOURCE

We used the synchrotron radiation light source to investigate the CO a dsorbate on Pt(001). We observed the valence band and the core-level s pectra with increasing the amount of the CO molecule exposure. The val ence band spectra showed the relation between the surface crystallogra phic change and the electronic structures of the CO molecule orbitals and the platinum d levels around the fermi energy. We also observed th at the photon irradiation might dissociate the CO molecule and change significantly the sticking coefficient of the CO adsorption on the sur face. The electronic structure after reaching the saturation coverage looks to be stable. Considering the stable surface structure after the CO saturation, we suggest that the CO molecule might be a good candid ate of a gas phase surfactant for the metal growth control.