[Zurück]

E. Gruber:
"Ion-induced nanostructures on surfaces: Comparing the effect of slow highly charged ions to grazing incidence swift heavy ions (Selected oral contribution)";
Vortrag: 26th International Conference on Atomic Collisions in Solids (ICACS-26), Debrecen/Hungary; 17.07.2014.

Ion impact on surface
s can induce surface modifications on the nano
-
scale
,
like
hillocks, pits or craters
[1]
. In order to
study
the mechanisms responsible for
nanostructure formation
,
we compare the effects of two different types of ions: slow
highly charged ions (HCI), where
mainly the potential energy plays a role in the surface
structuring process
[1
-
5]
, as well as swift heavy ions (SHI), where mainly the kinetic
energy is important
[1, 6
-
8]
. For both types of ions the surface damage process usually
exhibits a threshold, ei
ther in the charge state (HCI) or the kinetic energy (SHI)
[1]
.
While both types of ions excite
the electronic system
of the target
,
they
induce their
main damage in different locations: slow HCI produce predominantly surface damage,
whereas SHI do their d
amage mainly in the bulk (ion track).
In
our comparison,
we
therefore
concentrate on grazing incidence with SHI. This
particular collision geometry forces the track to a region close to the surface
[6]
,
comparable with the shallow damage of slow HCI
(see
Fig. 1). We present the results of
our comparative studies carried out with
normal incident
slow HCI from the ARIBE
facility and grazing incidence SHI from the IRRSUD line (at GANIL)
impacting o
n
three
target materials,whose reaction to ion beams is partia
lly known, i.e. CaF
2
, SrTiO
3
and
TiO
2
and discuss similarities and differences in the mecha
-
nisms responsible for
nanostructure formation.