THERMAL-ENERGY ATOM-SCATTERING STUDY OF PB SUBMONOLAYERS ON CU(110)

Submonolayers of Pb deposited at room temperature on a Cu(110) substrate undergo, with increasing Pb coverage, a continuous transition [lattice gas --> c(2 X 2) structure], followed by a first-order transition [c(2 X 2) --> p(4 X 1)]. The further transformation of the p(4 X 1) layer into a quasicompact hexagonal layer with p(5 X 1) structure occurs by elimination of domain walls, probably with intermediate formation of a p(9 X 1) structure.