Bewilligungen im Jahr 2008 - Volkswagen Stiftung

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Forschung mit Freie-Elektronen-Lasern: Peter Paul Ewald-
Fellowships
Berlin
Real time observation of chemical reactions on surfaces
Bewilligung: 08.07.2011 Laufzeit: 3 Jahre
The chemistry on surfaces governs the larger fraction of the industrially relevant chemical
processes and is a key ingredient to solve modern challenges for the society, like the
production of fuels in an eco-friendly way and the cleaning of exhaust gases from
combustion processes. Nevertheless, the details of the electronic structure during
reactions on surfaces are still unknown. The new hard X-ray free-electron lasers provide
a unique tool to study the formation and breaking of bonds after the reaction has been
induced by specific excitations. During the fellowship the formation of a chemical bond in
real time is studied for the first time by measuring changes in the electronic structure. As
example reaction the catalytic oxidation of carbonmonoxide will be used. In a secondary
project, the new opportunities of the Terahertz source at LCLS will be exploited to induce
novel ultrafast chemical processes on surfaces.
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung
Wilhelm-Konrad-Röntgen-Campus BESSY
Dr. Martin Beye
Albert-Einstein-Str. 15
12489 Berlin
Tel.: 030 806214677 // Fax: 0177 3185598
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Dresden
Focusing X-ray free-electron laser beams for imaging and creating extreme
conditions in matter
Bewilligung: 08.07.2011 Laufzeit: 3 Jahre
Modern X-ray free-electron lasers create new research opportunities, in particular
regarding investigations on ultrashort time scales. For most parts, such measurements
require a high spatial resolution as well. This can be achieved by means of magnified
imaging or diffraction techniques. In both cases focussing the X-ray beam is necessary;
this is one aim of the fellowship. Refractive lenses of Beryllium (Be-CRLs) are promising
optical components for the hard X-ray regime and have proven useful with various X-ray
sources. In the framework of this project focussing X-ray optics is implemented, optimized
and used at the "Matter in extreme conditions" experimental station at LCLS in Stanford.
The quality of the optics will be tested in various experiments, such as time-resolved
measurements of shock waves in aluminum and the preparation of warm dense matter.
Technische Universität Dresden
Institut für Strukturphysik
Dr. Andreas Schropp
Zellescher Weg 16
01062 Dresden
Tel.: 0351 46337588
Homepage: http://www.xray-lens.de
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