The Third Joint BER II and BESSY II Users' Meeting will be held from November 30 to December 2, 2011  in Berlin-Wannsee and Berlin-Adlershof. It will start with a "Neutron Instrumentation Day"  at the Lise-Meitner Campus in Berlin-Wannsee and continue with a "Science Day" and a "Synchrotron Radiation Intrumentation Day" at the Wilhelm-Conrad-Roentgen Campus in Berlin-Adlershof.

Richtfest und Grundsteinlegung des Detektor-Gebäudes für das Instrument NEAT.

Anomalous Small-Angle X-ray Scattering provides exceptional possibilities by combining the element-specific structural analysis with precise quantitative analysis of volume fractions and chemical concentrations in nano-scaled phases on a length scale from just above the atomic size up to several 100 nanometers of multi component systems. The workshop will address the disentanglement of complex scientific problems in chemistry, physics, biology, materials science and catalyst research like critical phenomena, kinetics of phase transitions, selfassembling of colloids, transport phenomena and catalytic activity. The complementary use of small-angle neutron scattering will be adressed.  Moreover theoretical, methodical aspects and future developments will be discussed.

The production of hydrogen from water and sunlight offers the possibility of an abundant renewable source of energy. For example, this could be achieved in a photo-electrochemical cell that splits water into hydrogen and oxygen by combining.

Holografie und Interferenz, eintägiges Experimentierpraktikum (ab 15 Jahre)

Task of the workshop on Demand and Characteristics of a New VUVis-beamline at BESSY II is to  
- elucidate the demand for potential new VUVis-Dipole-Beamlines (2-200 eV) at BESSY II 
- discuss the technical boundary conditions for the lay-out of a potential new beamline.

Wir öffnen zur Langen Nacht der Wissenschaften unsere Türen und geben Ihnen spannende Einblicke in unsere Forschung. Begeben Sie sich auf einen Rundgang durch die Experimentierhallen am Forschungsreaktor und besuchen Sie die Labore der Solarenergieforschung. Unser Schülerlabor lädt Kinder und Jugendliche zu Mitmach-Experimenten ein. Bitte bringen Sie zum Einlass Ihren Personalausweis mit.

In Kürze finden Sie hier uns ausführliches Programm. Informationen zu Tickets und zur Gesamtveranstaltung: http://www.langenachtderwissenschaften.de/

Vernissage am 13. April 2011 um 17 Uhr am WCRC 3. Etage Bürohauptgebäude

Open for ALL employees of HZB, Berlin and the IEK-5, Forschungszentrum Jülich.

Scope
Present status of neutron scattering in high magnetic fields sample environment for neutron sciences in magnetic fields fundamental physics problems in high magnetic fields.

Nuclear egress of Herpesviridae studied by electron and soft X-ray microscopy/tomography in cryo

2-day coordination meeting of magnetism activities of Helmholtz centers DESY, FZJ, HZG, and HZB. Guests most welcome!See provisional program and register! Next deadlines: 2 Jan. (hotel) and 10 Jan. (registration).

Program version #2 (please copy the link in your browser window or click on "PNI-Workshop Magnetism"):
https://www.helmholtz-berlin.de/media/media/oea/web/pr_webseite/veranstaltungen/2011/pni/pni_workshop_version2.pdf

Program version #1 with some introductory remarks can be found here:

Motivating the next generation of scientists to search for new approaches towards efficient, low cost and clean energy resources.

In this school we aim primarily at “priming” those outstanding finishing Ph.D. students that have not been connected with ASE in their Ph.D. research but do have a clear interest in the area, this last problem.

The unique feature of neutron scattering is that it delivers direct microscopic information in both space and time, while other spectroscopic probes are either local (such as hyperfine field methods) or macroscopic in the spatial dimension (such as light scattering). [...]

Die Arbeitsgruppe Reflektometrie des Kooperationsprojektes: "Mitwirkung der Zentren der Helmholtz-Gemeinschaft und der Technischen Universität München an der Design-Update-Phase der ESS"  organisiert einen eintägigen Workshop zum Thema

Reflektometrie an der ESS – Anforderungen und Perspektiven am 13. Oktober 2011 im Bayerischen Staatsbad Bad Reichenhall. Die Veranstaltung ist angegliedert an die Konferenz "Science Vision for the European Spallation Source – German Perspectives, 10-12 Oktober, 2011", am gleichen Tagungsort.

French – German Summer School on Science and Technology in Cultural Heritage / Wissenschaft und Technik in der Kunst / Science et Technologie pour le patrimoine culturel

Renewable Energies III: Photovoltaics & Solar Thermal
The International Summer University on Energy (ISUenergy 2011) invites you to participate in two unforgettable weeks to learn, experience and enjoy a series of seminars on renewable energy in the Swiss Alps. The school integrates different academic fields such as Physics, Material Science, Material Engineering, Architecture, Sociology, Political Science and Economics and it follows the successful ISUenergy  2009 and ISUenergy  2010.

Die in Berlin auf dem Gebiet der Strukturbiologie forschenden Wissenschaftler betreiben seit einem Jahr gemeinsam das Joint Berlin MX Laboratory. Am 17. August findet der zweite gemeinsame Workshop statt. Gastgeber ist diesmal das Max-Delbrück-Centrum in Berlin-Buch. Wer noch teilnehmen möchte, kann sich gern noch anmelden - per email an Prof. Dr. Udo Heinemann:

heinemann@mdc-berlin.de

Nächste Termine: 
NEU: 07.08.2011 (alle Plätze belegt)
ACHTUNG: keine Veranstaltung am 14.08.2011. Der Termin wurde vorgezogen auf den 07.08.2011.)

Beginn: je 11:30 Uhr

Anmeldung erforderlich (begrenzte Plätze).

Nächste Termine: 
31.07.2011 (alle Plätze belegt) und NEU: 07.08.2011 (alle Plätze belegt)
ACHTUNG: keine Veranstaltung am 14.08.2011. Der Termin wurde vorgezogen auf den 07.08.2011.)

Beginn: je 11:30 Uhr

Anmeldung erforderlich (begrenzte Plätze).

Nächste Termine: 17.07.2011 (alle Plätze belegt), 31.07.2011 und NEU: 07.08.2011
ACHTUNG: keine Veranstaltung am 14.08.2011. Der Termin wurde vorgezogen auf den 07.08.2011.)

Beginn: je 11:30 Uhr

Anmeldung erforderlich (begrenzte Plätze).

The workshop comprises a series of basic lectures on the topic and two extended practical sessions. It is aimed at PhD students in Biological Crystallography with little or no experience in diffraction data collection at a synchrotron.

A major opening event of the Russian-German Science Year will be the celebration of the 10th Anniversary of the Russian-German Laboratory (RGL) at BESSY II.

Functional materials are the backbone of efficient energy technologies, the harvesting of solar energy, clean chemistry as well as data storage and distribution. The interdisciplinary nature of these fields requires a complementary approach in the investigation methods. To get a grasp at functional materials with X-rays in a comprehensive way we have to approach the quantum mechanically linked parameters of energy and time as well as momentum and space through multidimensional X-ray methods, where simultaneous and complementary detection gives a full picture of the atomic processes driving materials function. [...]

This is an event from Heraeus-Stiftung and HZB. The goal of the seminar is to bring together young and experienced scientists from universities and from large-scale laboratories and facilities, who are using or planning to use neutrons or synchrotron radiation to study material that are related to energy research. It also aims at bringing together researchers conducting experimental characterization with scientists who have expertise in modeling.

Am Girl's Day haben Mädchen die Chance Berufe zu erleben und kennzulernen die bisher nicht häufig von Frauen gewählt werden.

The PV Thin-Film Week is the world's unique week devoted to thin-film photovoltaics. During the week, specialized scientific workshops meet with a practical industry forum on topics such as market development, production and financing. Both experts from R&D as well as executives and managers from the solar industry will meet at this international event in Adlershof. Additionally, investors and representatives from the press and politics will be present.

We kindly invite you to participate in the 3rd IRUVX-PP Annual Meeting 2011 from 21 – 23 March 2011 at HZB Berlin, Adlershof.

For further information and registration please visit the conference website http://www.iruvx.eu/annualmeeting2011.  

PLEASE REGISTER NOW.

Matthias Kreuzeder
On behalf of the IRUVX-PP project management team 
------------------------------------------------------------------------
Matthias Kreuzeder
Deutsches Elektronen-Synchrotron
EU-Projektbüro/ EU project office
Notkestrasse 85
22607 Hamburg
Germany

The linac driven Free Electron Laser at Hamburg, FLASH, is in user operation since 2005. It is capable to provide extremely short - sub 100 fs - photon pulses of more than 1e13 photons per bunch. Due to a super conducting linac it is possible to produce thousands of bunches per second. After the recent upgrade of the linac to a particle energy of 1.25 GeV, a maximum achievable photon energy in the water window could be achieved. The FLASH beam parameters enable a wealth of ground breaking new experiments targeting effects at extremely short time scales, non linear effects, and the generation and study of exotic states of matter. The extension of FLASH called FLASH II - pursued together with BESSY/HZB - by a second free electron laser will not only provide more capabilities for user beamtime but - even more important - serve also as a test bed for various seeding schemes. The latter ones will enable better defined spectral properties of the FEL radiation and help circumventing the temporal jitter inherent to all FELs.

Photoelectron spectroscopy is one of our major techniques for studying the properties of advanced materials. Valence photoelectron spectroscopy probes in a unique and direct way the electronic structure of a system.

In this lecture Prof. Khokhlov will consider some of the smart polymer systems developed in the lab at Moscow State University. First two examples are connected with the oilfield applications of polymers. He will describe the design of smart polymer fluids which can selectively block water layers in contact with the oil well (while the oil layers are not affected). Also, he will consider the design of smart fracturing fluids for oilfield applications. Such fluids are pumped under pressure into the well producing fractures in the surrounding medium with the length up to several kilometers. But as soon as the "oil pocket" is found, the viscosity of the fluid should drop considerably allowing oil to flow up the well. Both design strategies are based on the use of hydrophobically modified water soluble polymers.

Electron paramagnetic resonance (EPR) and electrically detected magnetic resonance (EDMR) techniques have a long standing tradition in material and in particular semiconductor research. In fact several fundamental EPR techniques have been first demonstrated on Si materials and provided unique information about the impact of paramagnetic sites on function determining semiconductor properties.

Invited speakers, all recognized scientists from leading world laboratories, will give lectures coveriing topics on the fundamental principles of the conversion of solar energy into chemical and electrical energy as well as their technological application in photovoltaic devices

Auch in diesem Jahr wird zum dritten Mal die interdisziplinär angelegte Internationale Sommer-Universität zu Erneuerbaren Energien III  stattfinden: die ISU^energy 2011.
Als wissenschaftliche Leiterin der ISU^energy 2011begrüßt Frau Prof. Dr. Martha Ch. Lux-Steiner die Bewerbungen interessierter Studierender entsprechender Fachrichtungen.
Ein Schwerpunkt soll neben der Photovoltaik und Solarthermie auch die Solararchitektur bilden.

Workshop for developers and advanced users of VITESS: ideas and concepts for future development. Location: LMC, Monday LR204, Tuesday DV108

Solution-phase chemistry has been investigated with time-resolved hard X-ray techniques for the past decade while its soft X-ray analogue is relatively new due to the underlying experimental challenges. The high chemical specificity and localized nature of core-levels make transient X-ray spectroscopy a powerful method to study chemical reactions in solution. Furthermore, the accessible information on valence charge distributions, spin-state, nuclear degrees of freedom, and their respective interplay is crucial for a microscopic understanding of reaction pathways.

I will review results from transient core-level spectroscopy in water and solvated transition metal-based spin cross-over compounds to demonstrate the feasibility and merit of ultrafast solution-phase X-ray spectroscopy [6,7]. Newer results of related solid and solvated organometallic compounds using ultrafast X-ray absorption and X-ray photo-emission spectroscopy will hopefully trigger discussion of method development and future research directions.

The response of isolated biomolecules upon VUV and soft X-ray photoabsorption and energetic ion impact is of great interest in the context of astrobiology and radiobiology. Key questions concern e.g. ion chemistry in the interstellar medium, the possibility of transport of intact gas phase biomolecules from space to earth and the molecular mechanisms underlying biological radiation damage.  We have developed an apparatus in which a home built electrospray ionization (ESI) source is combined with a radiofrequency (RF) ion trap and a time of flight mass spectrometer. First experimental campaigns focused on the investigation of dissociation dynamics in various protonated peptides in vacuo. For photoionization studies, the system was interfaced with the U125/NIM VUV beamline at the BESSY II facility (Berlin) and with the I411 MAXII soft X-ray beamline at MAX-lab (Lund).  Complementary experiments on keV ion induced peptide fragmentation where performed in-house, using a 14 GHz electron cyclotron resonance ion source.

VUV photodissociation of protonated leucine enkephalin was found to predominantly induce the loss of aromatic side-chains and related fragments. These channels are very likely due to fast bond-scission following e.g. population of a dissociative state before internal energy is equilibrated over the peptide and statistical fragmentation can set in. A systematic investigation of this process as a function of peptide size revealed a quenching of these fast channels in larger peptides. Furthermore, soft X-ray induced N 1s ionization localized on the leucine enkephalin backbone was found to trigger fast scissions in the adjacent side chain

Effects of electron interactions in different materials, including magnetic metals, superconducting oxides, pnictide and transition metal magnetic impurity on Graphene will be introduced.
Modern density functional theory describe well the ground state properties but not the spectroscopy of strongly correlated magnetic materials with transition or rare-earth elements. We introduce a simple dynamical mean field theory which allowed to investigate the correlations effects. Prospects of realistic description of the Mott metal-insulator transition in complex oxides will be discussed.

We discuss the properties of surface adsorbed magnetic nanostructures going from single adatoms via molecular magnets and metal-organic networks to larger islands and finally to alloy and interface induced magnetic hardness aiming at the smallest nanostructure with blocked magnetization at room temperature. Our discussion will give a critical assessment of the three experimental techniques, X-ray magnetic circular dichroism (XMCD), scanning tunneling microscopy (STM) with spin-polarization (SP) and spin-excitation spectroscopy (SES), and magneto-topical Kerr effect (MOKE). Particular focus will be on magnetic impurities on metals, on graphene, and on boron-nitride.

Upon a sudden change of the electronic temperature of a magnet its magnetization decays on a sub picosecond time scale and recovers slowly. We review experiments addressing the magnetization dynamics and compare them with recent spin polarized photoemission experiments done with FEL radiation. The total yield FEL experiments confirm the earlier non FEL results but allow the energy and spin resolved detection with femtosecond time resolution.

Various technical developments enlarged the potential of angle-resolved photo-emission (ARPES) tremendously during the last one or two decades. Obviously, this rises the need for a corresponding theoretical formalism that allows to accompany experimental ARPES studies in an adequate way. As will be demonstrated by several examples this goal could be achieved by various recent developments on the basis of the one-step model of photo-emission:

The spin-orbit induced Rashba-splitting of Shockley-type surface states is discussed using a fully relativistic description. The impact of chemical disorder within surface layers can be handled by means of the Coherent Potential Approximation (CPA) alloy theory. Calculating phonon properties together with the corresponding electron-phonon self-energy allows a direct comparison with features in the ARPES spectra caused by electron-phonon interaction. The same holds for the influence of electronic correlation effects. These are accounted for by means of the dynamical mean field theory (DMFT) that removes the most serious short comings of standard calculations based on the plain local density approximation (LDA). Finally, accounting for the photon momentum and going beyond the single scatter approximation for the final state allows to deal quantitatively with ARPES in the high-energy regime (HAXPES) that reduces the influence of the surface regime on the spectra. A new schme that accounts in addition for thermal vibrations in this context will be presented.

Rapid progress in ultrafast X-ray science worldwide, both in high-harmonic and X-ray free electron laser sources, has paved the way for a completely new generation of experiments investigating ultrafast processes in all areas of science. Femtosecond and attosecond pulses are now available spanning the extreme ultraviolet and soft X-ray regions of the spectrum that are perfectly synchronized to a laser. I will start with an introduction to high-harmonic generation (HHG) and survey the impact of using these table-top lightsources for the study of ultrafast material science. For instance, the laser assisted photoelectric effect (LAPE) could be demonstrated for IR-XUV excitation of a Pt(111) surface as well as laser assisted Auger decay (LAAD). Recent scientific breakthroughs employing X-ray pulses from HHG in the areas of correlated-electron materials and surface dynamics will be discussed.

Abstract: Ultrafast magnetization dynamics is an important issue for both fundamental science and for applications in order to optimize spin manipulation on a microscopic level. Since the first observation of laser induced spin dynamics¹, the mechanisms of angular momentum dissipation at picosecond timescales have been widely debated. In order to progress in the understanding of such microscopic ultrafast mechanisms, it is now possible to probe absolute values of magnetization with a high temporal resolution (100 fs). In this context, we have used ultrashort optical laser pulses (60 fs duration) to induce changes of the magnetization in a ferromagnetic CoPd alloy film with perpendicular anisotropy. The dynamics was probed with ultrashort circularly polarized femtosecond X-ray pulses, measuring the X-ray magnetic circular dichroism at Co L_2,3 edges². We observe that the two components of the magnetic moments (L and S) show different ultrafast dynamics and that the spin-orbit coupling related to the magneto-crystalline anisotropy in solids is strongly affected by fs laser pulses in the ultrashort time scales. We will compare our results with other pump probe experiments using MOKE and magnetic imaging techniques using X-PEEM.

Since the original work by Mott, the low efficiency of electron spin polarimeters [1] has limited their use in spectroscopy. Here we report a solution to this problem using a novel concept of multichannel spin polarization analysis that provides a stunning increase in efficiency by four orders of magnitude in comparison to the performance of state-of-the-art single-channel electron spin detectors. The latter are characterized by a figure of merit of 10⁻⁴. In spin-integral electron spectroscopy, modern hemispherical analyzers feature efficient multichannel detection with 10⁴ data points being acquired simultaneously. We are thus faced with a difference in counting efficiency of eight orders of magnitude. In first experiments we have studied Heusler films [2]. The novel approach paves the way e.g. to spin-resolved experiments with highly reactive surfaces, to low-intensity experiments like HAXPES in the valence region and to single-shot experiments at laser-based XUV or FEL sources. The same approach can be used in an imaging set-up, where the principal capability for parallel acquisition of 3800 spin-polarization data points was proven [3]. The novel polarimeter can be attached to dispersive electron spectrometers and to time-of-flight devices. Besides spin-resolved spectro(micro)scopy it can be used for spin-filtered real-space imaging [3] and spin-filtered momentum microscopy. The basics of the method are discussed, first results are presented and future applications are outlined.

Our work is embedded into the research performed at the General Energy Department PSI on a sustainable energy supply for future mobility by catalytic conversion of renewable primary fuels (e.g. biomass) via synthesis gas (CO + x H₂) to secondary fuels (hydrogen, methane) as well as DeNO_x SCR processes. One aim in heterogeneous catalysis is to understand detailed surface-reaction mechanisms  and reaction-induced surface modifications on a molecular level: i) detailed surface-reaction mechanisms, and ii) reaction-induced surface modifications (processes like oxidation, reduction, clustering, deactivation). For a certain reaction, studies of both commercial and model catalysts with identical composition have been performed. In combination with experimental techniques (XPS, IR/DRIFTS, XAS) a comprehensive view of the processes at the catalyst surface can be obtained by theoretical modelling of the reaction mechanism using the ab initio DFT method.

A review about our recent theoretical studies concerning a variety of industrially relevant catalysts such as TiO₂, g-Al₂O₃, V₂O₅/WO₃-TiO₂ and Ni/Al­₂O₃, Fe-ZSM-5, will be given [1]. Aspects of the metal oxide surface structure, the stability and structure of metal clusters on the support are discussed as well as the reactivity of surfaces, including their behaviour upon poisoning. Exemplarily, it will be demonstrated how such theoretical considerations can be combined with DRIFT and XPS results from experimental studies.

Ultrafast x-ray absorption experiments have been carried out at the Advanced Photon Source, Argonne National Laboratory, 7ID-C. While the x-ray pulses length produced by the synchrotron is about 100 ps, a temporal resolution of 2 ps has been achieved by detecting the x-radiation transmitted though the sample with a streak camera. The iron K-edge shift of a sample of Fe(CO)₅ solvated in ethanol was measured at a repetition rate of 1 kHz. The experimental arrangement is described. It consists of x-ray and pump light optics, the laser triggered streak camera, and a liquid sample beam apparatus that permits studying chemical reactions under protective atmosphere. The apparatus contains x-ray and laser beam diagnostic for x-ray and laser beam profile and overlap measurements as well as pump-probe timing measurements with sub-ps accuracy. The results demonstrate that single picosecond temporal resolution can be achieved at a synchrotron beam line. The measured data suggest that the photo-dissociation of the CO –ligands is followed by geminate recombination and ligand substitution.

Modern synchrotron based Macromolecular Crystallography (MX) is a powerful method to determine structures of biological macromolecules and their complexes to atomic resolution, and to thereby solves some of the grand challenges in modern biology. For this purpose, all up-to-date storage ring facilities worldwide are providing beamlines and experimental end-stations as well as a dedicated user access program to facilitate this experimental approach.
Topics: 
In situ crystal screening, Long wavelength phasing, In situ spectroscopy, radiation damage, sample preparation, crystal dehydration

Within the past few years our user community has performed significant scientific breakthroughs in the field of ultrafast x-ray science mainly studying ultrafast magnetism.  After recent upgrades of our slicing source, a new class of experiments using tunable optical excitation in optical pump-X-ray probe experiments will be feasible.
Topics: 
Ultrafast magnetism, ultrafast dynamics in correlated systems, ultrafast X-ray sources

The DESY kindly invite you to participate in BMBF-sponsored Workshop Instrumentation and Methods Development for Synchrotron-based Biomedical Research. The workshop will feature the rapidly emerging field of synchrotron-based research in the life sciences with strong emphasis on current technology-driven developments in synchrotron instrumentation.

You are invited to be an active part of this conference by submitting your abstract to one of the following topics:

Developments of measurement methods and instrumentation, Material processing and residual stresses, Influence of residual stresses on physical and mechanical properties of materials and components, Measurement and assessment of residual microstresses and intergranular stresses, Residual strains and stresses in complex materials - e.g. multiphase materials and biomaterials, Residual stresses in thin films and microcomponents, Industrial applications of residual stress analysis using synchrotron radiation, neutrons, and X-rays, Complementary methods for materials analysis with photons and neutrons: Imaging, Texture, etc.

A joint energy/science partnership between Europe and MENA to promote sustainable development in view of global challenges.

The 13th International Workshop on Plasma-Facing Materials and Components for Fusion Applications / 1st International Conference on Fusion Energy Materials Science will take place from 9 - 13 May 2011 in Rosenheim, Germany.

Materialien – Module – Systeme