STM STUDY OF OXYGEN ON RH(110)

The (2X2)p2mg and c(2X2n) structures induced by oxygen adsorption on R h(110) have been examined by means of scanning tunneling microscopy. T he real-space images show the glide and centered symmetry required by the diffraction patterns, as well as substrate reconstruction. In addi tion, a metastable (6X2) structure and a number of defects have been i dentified and characterized, including an anti-phase domain wall in th e (2X2) structure. Where a step defect separates two c(2X8) domains, t hey tend to adopt a specific morphological relationship.