NEW STM IMAGE STRUCTURES IN THE CONFINED REGIONS OF THE PT(001) SURFACE

In the regions confined by line defects of the reconstructed Pt(001)su rface, new STM image structures have been observed. They can be seen o nly in a narrow energy window from the Fermi level. These new image st ructures represent redistribution of surface electronic charges as a r esult of the quantum confinement effect of the line defects. The new e lectronic density of states distributions are closely related to the o riginal atomic corrugation. Their image intensities are uniform over t he entire confined areas. Our observations and a model calculation sup port that the quantum confinement induced electronic charge redistribu tion is strongly coupled to the atomic arrangement.