HIGHER-ORDER RECONSTRUCTIONS OF PT(110) INDUCED BY IMPURITIES

In the early stages of cleaning a Pt(110) crystal, an interesting seri es bf reconstructions is found to appear, which are attributed to diss olved carbon-based impurities diffusing to the surface. By carefully c ontrolling the preparation conditions while measuring with surface X-r ay diffraction, we were able to investigate the structures of these re constructions and explain them with a simple Hendricks-Teller model. T o explain the unusual evolution of the linewidth, we found it necessar y to invoke the existence of a new (1 x 5) local arrangement, intermed iate between the previously observed (1 x 2) and (1 x 3) phases.