Chemistry Reference
In-Depth Information
Fig. 6 Attachment energies to form the displayed Au clusters, calculated for bulk MgO(001)
(
black circles
) and 2 ML MgO/Ag(001) films (
orange squares
). The
blue squares
depict the
second most stable isomers on the thin film. On the oxide film, linear configurations are energet-
ically preferred up to Au
5
, when planar isomers become more stable. The odd-even oscillations in
the attachment energy are related to the high energy of open-shell systems containing an unpaired
electron. They are less pronounced on thin MgO films due to the screening influence of the Ag
support [
48
]
Fig. 7 STM image and structure model for Au
7
chains bound to the two reflection domains in the
alumina/NiAl(110) film (5
5nm
2
). The chain orientation and the NiAl [001] direction are
indicated by
dashed
and
solid lines
, respectively. Although the two domains are tilted against each
other by 48
, the chains closely follow the NiAl [001] direction in both cases. The sketches on the
right side
show the Al
3
2
top layer (
open spheres
), the Au chain atoms (
yellow
,
filled spheres
), as
well as the NiAl and alumina unit cells, being depicted with
grey
and
red lines
, respectively [
40
]
