ISLAND ORDERING ON CLEAN PD(110)

[摘要] High resolution low-energy electron diffraction measurements are reported that demonstrate the existence of semiordered islands on the clean Pd(110) surface. The islands are stable up to 1000-degrees-C and are approximately 90 atoms long in the [001] direction. A simple model is presented that makes use of step-step interactions to generate the periodic island structure. This model predicts that ordered islands form below the roughening temperature if the step creation energy is small compared to the step-step interaction. A justification for this condition is given for the Pd(110) surface.

[关键词] 110 SURFACES;CRYSTAL-SURFACES;RECONSTRUCTION;DIFFRACTION;STRESS