L. Lottermost et al., BISMUTH ON COPPER(110) - ANALYSIS OF THE C(2X2) AND P(4X1) STRUCTURESBY SURFACE X-RAY-DIFFRACTION, Surface science, 373(1), 1997, pp. 11-20
Surface X-ray diffraction has been used to analyze the atomic structur
es of the Cu(110)-c(2 x 2)-Bi and Cu(110)-p(4 x 1)-Bi reconstructions
with submonolayer coverages. A quasi-hexagonal c(2 x 2) adlayer struct
ure is formed when half a monolayer of bismuth is deposited; the cover
age corresponds to 1.08 x 10(-15) atoms cm(-2). There is one Bi atom p
er c(2 x 2) surface unit cell, and the nearest-neighbor distance on th
e planar overlayer was found to be 4.43 Angstrom. In the case of the p
(4 x 1) reconstruction formed at a coverage of 0.75 monolayers, both t
he in-plane and out-of-plane data are in excellent agreement with a mo
del in which every fourth Cu row in the [001] direction of the topmost
layer is replaced by Bi atoms to form a substitutional surface alloy.
(C) 1997 Elsevier Science B.V.