De. Gardin et al., CARBON, NITROGEN, AND SULFUR ON NI(111) - FORMATION OF COMPLEX STRUCTURES AND CONSEQUENCES FOR MOLECULAR DECOMPOSITION, Surface science, 296(1), 1993, pp. 25-35
The decomposition of simple amines on Ni(III) produces a c(5 square-ro
ot 3 x 9)rect LEED pattern similar to the one reported earlier after r
eaction of H2S, C2H4, CO, NO and CH3CN on a Ni(111) surface. We have m
easured LEED IV curves of the structure obtained after deposition of c
arbon and nitrogen on a Ni(111) surface. The similarity between these
IV curves shows that carbon and nitrogen have similar local geometries
. The most intense spots of the c(5 square-root 3 x 9)rect LEED patter
n are explained by the formation of a (100) orientation nickel monolay
er, with the carbon or nitrogen atoms in the 4-fold hollow sites. This
is supported by the qualitative similarity of the IV curves with thos
e of the Ni(100)-(2 x 2)-2C structure. We have also produced a (2 x 6)
nitrogen induced structure on Ni(111) and compared it to the very sim
ilar (5 square-root 3 x 2)rect structure obtained by adsorption of sul
fur on Ni(111) that has also been interpreted as due to a (100) recons
truction of the Ni(111) crystal surface.