[Zurück]

Y. Wang, C. Dufour, V. Khomorenkov, M. Toulemonde, Z. Wang, F. Aumayr:
"Extrapolation of the inelastic thermal spike model developed for swift heavy ions to highly charge ions to describe surface modifications";
Poster: 26th International Conference on Atomic Collisions in Solids (ICACS-26), Debrecen/Hungary; 17.07.2014.

Potential energy carried by slow high
ly
charge
d
ions (HCI) [1]
, i.e., the sum of
binding energies of all missing electrons,
is used to induce surface modification at a
nanometric scale. In the continuation of experiments re
garding surface modifications
on CaF
2
by El
-
Said et al. [2] using HCI and by Khalfaoui et al. [3] using swift heavy ions
(SHI), Wang et al. [4] have shown that there is
a
n experimental
linear relationship
between the electronic energy loss and the deposite
d potential energy, leading to an
additive interaction of two mechanisms of energy deposition
. This relation establishes
a link between the fraction (F) of the deposited potential energy and its depth (d) of
deposition near the sample surface, d/F = 4.3 nm
. Such link suggests also that the
hillocks induced by
slow
HCI may be described by models developed to predict
material modifications induced by SHI, especially the inelastic thermal spike model [5],
recently applied for CaF
2
[6].
Here
it is proposed to a
pply this model to hillock
formation by highly charge ion in three dimensional geometry [6,7] for CaF
2
to quantify
the potential energy threshold and the depth of material modifications.