ELFT HÍRADÓ

["Gabor Fath" <fath AT szfki.hu>]

Kedves Kollégák!

Dézsi István (RMKI) kért meg a következok közzétételére:

[F.G.]


A KFKI RMKI és a KFKI CMRC anyagkutatás szemináriumának
következo eloadásait

                             Prof. H. Ibach
        az  Institut für Grenz- und Oberflächen, ISG3 igazgatója,
Forschungszentrum Jülich
Surface Stress and Surface Tension as Driving Forces for  Restructuring of
Surfaces
on an Atomic and Mesoscopic Length Scale,
és
                        Prof. Margret Giesen
Institut für Schihten und Grenzflachen, ISG4, Forschungszentrum Jülich
Dynamics of nanostructures at interfaces
címmel tartja

Az eloadások helye:

                   KFKI RMKI 3. épület, tanácsterem (2. em.)

 Idopontja:

                       2003. május 29., csütörtök, 14:00.

Az eloadáson minden érdeklodot szeretettel látunk.

                                                  Dézsi István


Surface Stress and Surface Tension as Driving Forces for a Restructuring of
Surfaces on an Atomic and Mesoscopic Length Scale
Harald Ibach

Institute of Thin Films and Interfaces ISG3, Research Center Juelich,
Germany



The presentation commences with the seemingly, yet in reality not so trivial
definitions of surface stress and surface tension for surfaces in vacuum and
for charged surfaces in contact with an electrolyte. Methods to measure
variations in surface stress we be considered briefly. It is shown that some
of well known surface reconstructions can be understood as being caused by
large compressive surface stresses. The potential dependent reconstruction
of gold surfaces in contact with an electrolyte is revisited with recent
advances in the theoretical understanding in mind. Minimization of the step
line tension is the well known driving force for coarsening phenomena on
surfaces. A few examples of Ostwald-ripening will be presented in that
context. The formation of stress domains on surfaces which tend to
self-assembly into regular patterns on the nanometer length scale will also
be discussed.



Dynamics of nanostructures at interfaces

Margret Giesen

Forschungszentrum Jülich, Institut für Schichten und Grenzflächen, ISG 4

D 52425 Jülich



Self-assembly of nanostructures is considered as one of the key instruments
of device technology to the ever more shrinking dimensions of devices. Quite
a few methods for self-assembly of nanostructures are associated with the
kinetics, kinetic instabilities or as an equilibrium phenomenon with the
properties of steps and islands on surfaces. Therefore it is important to
understand the dynamical and kinetical aspects of nanostructures on the
atomic scale. We focus our studies on equilibrium phenomena such as
one-dimensional nanostructure perimeter fluctuations and on non-equilibrium
phenomena such as nanostructure stability and decay. To learn about the
basic atomic transport mechanisms associated with these phenomena we
concentrate on model nanostructures such as monatomic steps and monolayer or
multilayer high islands. This lecture is about the basics of how one can
apply theoretical methods well known from statistical physics to analyze STM
image movies to obtain quantitative information on atomic diffusion
processes and basic energy parameters at interfaces.



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