Growth and structure of Pd alloys on Cu(100)

摘要: Abstract The growth and structure of Pd alloys formed on Cu(100) have been studied from the initial nucleation to formation a second-layer structure, using scanning tunneling microscopy (STM) Rutherford backscattering spectroscopy (RBS). STM images show that individual atoms initially alloy into lattice sites substrate, with preference for occupation second-nearest neighbor (NN) sites. This results in short, [001] [010]-directed chains which converge form c(2 × 2) as coverage is increased. Copper ejected by incorporation surface Cu islands terraces. such alloyed terraces subsurface Pd, consequently, greater amount required than ideal 0.5 monolayer (ML). Nucleation second layer seen at upper step edges before first completed. Continued deposition completion further (topmost) phase LEED appears p4g symmetry, while p(2 periodicity revealed STM. A model proposed mixed forming top reconstructed layer.