Chemistry Reference
In-Depth Information
Fig. 6.3
The center of mass diffusion trace of six-atomic Pb cluster on Cu(111) at 400 K
The atomistic simulations reveal well-defined size effect of diffusion coefficient
for clusters consisting 1
10 atoms, Fig.
6.4
. The size dependence of D,
presented in Fig.
6.4
, manifests clear oscillations increasing the number of atoms in
the cluster. The observed variation of
D
does not follow the
D
<
N
≤
N
−
α
scaling and
could be explained by the model of open and closed geometrical shapes of islands
[
29
,
30
]. As expected, the seven-atomic cluster, having compact shape because of
fcc(111) symmetry, has lower mobility compared to the open six-atomic cluster.
∝
Fig. 6.4
Size-dependent oscillations at
T
400 K of diffusion coefficient
D
2D
of
N
-atomic Pb
cluster on Cu(111) surface (from Michailov and Vladkov [
32
], Copyright c
=
2007 Elsevier B.V.)
