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Dust-Dust Interaction in a Magnetized Plasma Flow

26.01.2015

The new superconducting magnet system SULEIMAN recently installed in the magnetized plasma lab of the group of Prof. Piel, has started operation and pushes the scientific frontier of experimental dusty plasma research a major step forward towards strongly magnetized dusty plasmas. In the recent issue of Physical Review Letters, Jan Carstensen, Franko Greiner and Alexander Piel report about investigations with a high-precision resonance method. They find that strong magnetic fields substantially modify the interparticle forces in dusty plasmas, when the time scale of the ion cyclotron motion becomes comparable to the time scale of the ion plasma oscillations. For typical dusty plasma parameters this transition takes place at magnetic inductions of the order of a few Tesla, which are now experimentally accessible. This work has been performed in the framework of the SFB-TR24

Plasmonic remote control

26.01.2015

Plasmonics - controlling and using light in nanostructures - is currently among the hottest topics in condensed matter physics. In a recent article Natalia L. Schneider and Richard Berndt show

that nanoscale plasmons may be used to remotely excite molecules to fluoresce. The plasmons in turn are excited by an electrical current, which makes the experimental approach particularly attractive as no background light is involved.

The article has been selected for an "Editors' Suggestion" of Physical Review.

Marslandung erfolgreich - Kiel begeistert

26.01.2015

(CAU Presseinformation 225/2012 vom 06.08.2012)

Wake up on Mars

26.01.2015

Liveübertragung der "Curiosity"-Landung auf dem Mars

am 6. August von 6 - 8 Uhr im Max-Planck-Hörsaal, Physikzentrum der CAU.

-- Veranstaltungsprogramm --

 

CAU Presseinformation: 217/2012 vom 27.07.2012

 

Pressemeldung Welt Online: "Curiosity"-Landung duldet keinerlei Fehler

Switching of a tin-phthalocyanine: Current and Force

26.01.2015

A poster prize has been awarded to Nadine Hauptmann at the 15th International Conference on non-contact Atomic Force Microscopy 2012 in Cesky Krumlov (Czech Republic). The prize was sponsored by the company Specs for an excellent poster presentation and outstanding research topic. The conference was devoted to the latest progress in dynamical atomic force microscopy and brought together 200 scientists from all around the world. Nadine is currently working on her Ph.D. in Prof. Berndt's group. Within her Ph.D. project she investigates molecular switches using combined STM and AFM m easurements. Her topic is a key subject in the SFB 677 "Function by switching". In particular, her work focuses on the acting forces when contacting the molecules with a metal electrode.

Förderpreis der Ralph Norwid Schindler Stiftung für Dr. Christian Hamann

26.01.2015

Dr. Christian Hamann wurde für seine Dissertation "An electrospray ion source for ultra-high vacuum deposition of organic molecules" mit dem Förderpreis der Ralph Norwid Schindler Stiftung ausgezeichnet. Der Preis wurde beim Sommerfest des Fördervereins der Mathematisch-Naturwissenschaftlichen Fakultät am 26. Juni überreicht. Er besteht aus einer Urkunde und einem Preisgeld. Während seiner Promotion bei Prof. Berndt, Institut für Experimentelle und Angewandte Physik, entwickelte Dr. Hamann eine neue Quelle für reinste Molekülstrahlen, mit der Oberflächen beschichtet werden können.

Glatt gekupfert! Geebneter Weg zur Chipverdrahtung

26.01.2015

Kieler Physiker entdecken anomale Abscheidung von Kupfer

(CAU Presseinformation 182/2012 vom 22.06.2012)

Waves in strongly coupled magnetized plasmas

26.01.2015

It is long known that the correlations between individual particles in dense or cold plasmas give rise to fascinating new phenomena such as the emergence of new collective oscillation modes which are important, e.g., for the energy balance of neutron stars. Strong magnetic fields, on the other hand, often permeate plasmas and significantly influence their diffusion and collective behaviour. What happens when both these conditions - strong correlations and strong magnetic fields - apply in a plasma, is the focal point of the research carried out by Torben Ott and Hanno Kählert at the chair of Prof. Michael Bonitz at the Physics Department of Kiel University which has now been published in Physical Review Letters. Using semi-analytical theory together with large-scale first principle computer simulations, the existence of six principal waves propagating along and perpendicular to the magnetic field could be predicted and described which show the complicated interplay of correlational and magnetic field effects.
 
 
The figure shows simulation data (color scale and error bars) together with analytical results (solid lines) for the dispersion relation of these six waves. L and T denote the longitudinal and transverse oscillation spectra, respectively.

Evidence for Chirped Auger-electron Emission

26.01.2015

If a high-energy photon liberates an inner-shell electron from an atom, a photoelectron and a core vacancy are created. The latter is subject to decay, which produces Auger electrons with charateristic energies. For cases in which the Auger electron is faster, it may overtake the preceding photoelectron. Due to the altered screening of the ion's charge, the result is an exchange of energy between both electrons. This effect is known as post-collision interaction and happens during 0.1 to 100 fs after the photoionization. Now, the first observation of this overtaking process in the time domain was achieved by experimentalists from Hamburg University and DESY, led by Markus Drescher. To achieve this, femtosecond XUV pulses from FLASH were combined with a THz streak camera in a pump-probe fashion. The Auger-electron energy spectra were interpreted by Sebastian Bauch, PhD student at the chair of Michael Bonitz (ITAP), utilizing quantum and classical simulations as well as an analytical line shape model. The results are published in Physical Review Letters.
 
 
Press releases of the CAU and Hasylab

 

The figure shows the comparison of the measured and the calculated Auger-electron spectra for different pump-probe time delays. The overtaking process manifests itself in different linewidths for rising and falling slope of the vector potential (center and lower panel).

Controlling spin-crossover of a single molecule

26.01.2015

For using single molecules as building blocks in spin-electronics (spintronics) it is important to be able to manipulate their spin state. In metal-organic complexes this is achieved by co-ordinating ligands to a metal centre, which leads to ligand-induced spin switching (LISS). Alternatively, spin crossover (SCO) complexes may be used, whose spin state may be controlled by temperature, light, pressure or magnetic fields. In contrast to LISS, SCO does not require chemical changes of the molecule. While the SCO effect has long been know from bulk materials control of the spin state of single SCO molecule has now been demonstrated for the first time by Gopakumar et al. By injecting electrons into selected molecules the IEAP researchers switched molecules between states with low or high spin. The work has been performed in a collaboration of the Tuczek and Berndt groups with funding through SFB 677. It has been selected as a Hot Paper in Angewandte Chemie.

Mit Columbus im All

26.01.2015

Kieler DOSIS wieder im

Einsatz

(CAU Presseinformation 142/2012 vom 15.05.2012)

Successful participation of Kiel and Greifswald SFB-TR24 members in the German Physical Society Spring meeting of the Plasma Physics Division

26.01.2015

 
Two "best poster" awards: Jan Carstensen (IEAP, CAU Kiel, project A2) is awarded the prize for the best experimental poster. The poster is entitled "Aufladung und Wechselwirkung eines Partikelpaares in der Plasmarandschicht", co-authors are Franko Greiner, Dietmar Block, Jan Schablinski, Wojciech Miloch and Alexander Piel. Hauke Thomsen (ITAP, CAU Kiel, project A5) is awarded the prize for the best theory poster. The poster is entitled "The Triple Correlation function as a tool for structural analysis", co-authors are Patrick Ludwig and Michael Bonitz.

Surface-trapped light pulses monitored in real-time during propagation

26.01.2015

Light fields can propagate along metal surfaces via coupling to charge oscillations of the conduction electrons. The two-dimensional nature of these so-called surface plasmon polaritons (SPP) is highly attractive for applications in nanoscale photonics with prospects in data transport and processing. In a recent work published in Nano letters, Michael Bauer and his team from the IEAP, together with the groups of Martin Aeschlimann (TU Kaiserslautern) and Carsten Reinhardt (Laser Zentrum Hannover), succeeded in imaging the propagation of ultrashort SPP pulses in a two-dimensional microscopic focusing unit. At a time-resolution of about 10-14 seconds, the researchers monitored how the pulses evolve in space and time as they pass the focal point. The presented experimental approach is a promising tool for analyzing the capabilities of future nano-optical components used in high-speed applications. The work was funded by the German Science Foundation (DFG) through Priority Program 1391 “Ultrafast Nanooptics”.

Best Poster Prize at the Gordon-conference

26.01.2015

Ankatrin Stange was awarded with a Best Poster Prize at the Gordon-conference 'Ultrafast Phenomena in Cooperative Systems' in Galveston, Texas, for her presentation on hot-carrier dynamics in graphite. Ankatrin Stange is a Ph.D. student in a cooperative project of Kai Rossnagel, Michael Bauer and Lutz Kipp on time-resolved photoelectron spectroscopy with femtosecond (10-15s) temporal resolution.
The image shows ultrashort snapshots of the electronic structure of graphite after photoexcitation with intense femtosecond laser pulses recorded in time steps in the 100 fs regime.

Erstes Teilchenereignis auf Mars-Mission gesichtet

26.01.2015

Strahlungssensor der Uni Kiel arbeitet einwandfrei

(CAU Presseinformation 28/2012 vom 30.01.2012)

Geschichte der Kieler Physik und Astronomie neu erschienen

26.01.2015

Zum 300. Gründungsjubiläum der Christian-Albrechts-Universität im Jahre 1965 erschien die 1. Auflage der Schrift von Charlotte Schmidt-Schönbeck über die Geschichte der Physik und Astronomie an der Kieler Universität. Die kleine Erstauflage war rasch vergriffen und auch von einem Nachdruck in 1983 sind nur wenige Exemplare verfügbar. Diese Schrift ist inzwischen zu einem Standardwerk geworden. Sie ist nun in einer korrigierten zweiten Auflage erschienen (Herausgeber: Prof. Dr. A. Piel) und ist in Form einer preiswerten Studienausgabe (Format DIN A4 zweispaltig, 157S., 29 Abb. im Text) gegen eine Schutzgebühr von 12,00 Euro im Sekretariat LS19-102 erhältlich. Näheres zur Autorin, ein Blick ins Buch sowie Bezugshinweise finden sich unter 

Strahlenmessung erfolgreich gestartet

23.01.2015

Früher als erwartet konnte die Kieler Sensoreneinheit im Strahlenmessinstrument RAD (Radiation Assessment Detector) erste Daten von ihrem langen Weg zum Mars liefern.

(CAU Presseinformation 221/2011 vom 16.12.2011)

November 2011

23.01.2015

Von der Kieler Förde zum Mars

NASA und Deutsches Zentrum für Luft- und Raumfahrt setzen auf Kieler Technik

 (CAU Presseinformation 201/2011 vom 25.11.2011) 


 

Die Amerikanische Physikalische Gesellschaft hat Prof. Michael Bonitz zum Fellow gewählt. In der Begründung heisst es: "For pioneering contributions to the field of strongly correlated classical and quantum plasmas, including the development of a statistical theory and first-principle computer simulations."

ESA-Mission Solar Orbiter

23.01.2015

Am 4. Oktober wurde die ESA-Mission Solar Orbiter definitv ausgewählt. Solar Obiter soll erforschen, wie die Sonne die Heliosphaere erzeugt und kontrolliert. Die wissenschaftliche Nutzlast besteht aus zehn Instrumenten, das IEAP ist an 4 davon beteiligt, an einem mit einer massiven Hardwarebeteiligung. Die Abteilung Extraterrestrische Physik baut die vier Sensoren EPT, HET, SIS und STEIN, welche energiereiche Teilchen von der Sonne in verschiedenen Energiebereichen messen sollen.

On Oct. 4, 2011, ESA selected Solar Orbiter as the next science mission after BepiColombo. Solar Orbiter will investigate how the Sun creates and controls the heliosphere. The scientific payload consists of 10 instruments. IEAP participates in four of them and will make a major hardware contribution to one, the Energetic Particle Detector, EPD. The Extraterrestrial Physics Division will build the four sensors EP, HET, SIS, and STEIN which measure solar energetic particles in different energy ranges. 

Erfolgreiche Ballonflug Kampagne

23.01.2015

Fast 100 Jahre nach der Entdeckung der Kosmischen Strahlung durch Viktor Hess, rüsteten Kieler Physiker wieder ein Ballon mit einem Strahlungssensor aus.
Dieser BEXUS13 genannte Forschungsballon startete am 28. September vom europäischen Raketen- und Ballonstartplatz Esrange bei Kiruna in Schweden. BEXUS (Ballon-EXperimente für Universitäts-Studenten) ist eine Studentenkampagne des Deutschen Zentrums für Luft- und Raumfahrt (DLR) und der Schwedischen Nationalen Raumfahrt-Behörde SNSB (Swedish National Space Board) in Zusammenarbeit mit der Europäischen Weltraumorganisation ESA. Der BEXUS13 Ballon erreichte, während seiner 5 stündigen Flugdauer eine Höhe von 25Km.
Zu der wissenschaftlichen Nutzlast von Studentenexperimenten aus verschiedenen Europäischen Ländern, gehörte auch der Strahlungssensor FRED (Flight Radiation Environment Detector), welcher im Rahmen des Projektes Radition Exposure in The Atmosphere von den Doktoranden Bent Ehresmann, Johannes Labrenz, Lauri Panitzsch und Thomas Möller der Abteilung Extraterrestrische Physik an der CAU Kiel entwickelt und hergestellt wurde.
Dieser aus vier Silizium Detektoren aufgebaute Strahlungssensor ermöglicht eine detaillierte Untersuchung des Strahlungsfeldes in unterschiedlichen Höhen der Erdatmosphäre. Eine genauere Kenntnis des Strahlungsfeldes in größeren Höhen wird an Bedeutung gewinnen, da die zukünftig geplanten Überschallflugzeuge in diesen Höhen fliegen werden. Außerdem wird in Zukunft der Weltraumtourismus in den nahen Weltraum zunehmen. Diese Messung sollen erste Erkenntnisse über die Strahlenexposition von Personen liefern, die an solchen Flügen teilnehmen werden.

Diffusion of charged particles in strong magnetic fields

23.01.2015

How a magnetic field affects the trajectory of a charged particle is one of the first questions which arise in the study of plasmas: The trajectory is bent around the magnetic field lines, resulting in a gyrating motion perpendicular to the magnetic field. Along the magnetic field, the particle can move freely and the particle's total motion is a helical path. The diffusion of an ensemble of only weakly interacting particles is, therefore, unaltered along the magnetic field lines. Across the magnetic field, the diffusion is reduced proportionally to 1/B in the limit of strong fields, the so-called Bohm diffusion. If, however, the particles are strongly interacting, for example because they are very cold or very highly charged, this well-accepted picture has to be changed (see Figure): While the diffusion across the magnetic field shows Bohm diffusion as in weakly coupled plasmas, now also the migration of particles along the field lines is slowed down - an effect of the strong correlations between the particles. The diffusion coefficient falls as 1/Bα, where α is 1 for very strongly correlated systems and between 0 and 1 for less strongly correlated systems. This is illustrated in the figure where β denotes the strength of the magnetic field (ratio of cyclotron frequency and plasma frequency) and Γ, the coupling strength (ratio of interaction energy to kinetic energy). Using computing resources at the HLRN, the research group of Prof. Michael Bonitz has discovered this effect and investigated it in detail in large scale first principle computer simulations: http://http://link.aps.org/doi/10.1103/PhysRevLett.107.135003

25 Sekunden in der Schwerelosigkeit

23.01.2015

Kieler Plasmaphysiker nehmen an Parabelflügen teil 

DOSIS zurück in Kiel

23.01.2015

CAU verbessert Strahlenmessgerät für nächste Weltraummission. 

Discovery of a spontaneous atomic-scale magnetic skyrmion lattice in two dimensions

23.01.2015

Skyrmions are topologically protected field configurations with particle-like properties which play an important role in various fields of science ranging from elementary particles to condensed matter physics. Particularly exciting was the recent discovery of skyrmions in magnetism observed in a special class of magnetic bulk alloys: MnSi, FeGe, and CoFeSi. In these systems a lattice of skyrmions on the scale of 20 to 90 nm was induced by an external magnetic field. In contrast, the group of Stefan Heinze in collaboration with colleagues from the University of Hamburg and the Forschungszentrum Jülich now reports in Nature Physics the observation of an atomic-scale magnetic skyrmion lattice as the spontaneous ground state of an ultra-thin film on a surface. This discovery opens new vistas to locally probe and manipulate the static, dynamic, and spin transport properties of topologically protected spin textures at surfaces or interfaces.
 
Image: Courtesy of M. Menzel (Univ. Hamburg

Poster Prize for Gerald Rohde

23.01.2015

At the Summer School ‘Exciting Excitations: From Methods to Understanding’, organized by the SFB 616: Energy Dissipation at Surfaces /University of Essen-Duisburg, Gerald Rohde, diploma student in Professor Bauers's group, was awarded a best poster prize. Gerald presented most recent data on the ultrafast dynamics of hot carriers in graphite and graphene as probed with ultrashort light pulses in the XUV spectral regime. The results were obtained in a close collaboration with the group of Prof. L. Kipp/PD K. Rossnagel.

IEAP und ITAP schreiben Frauenförderung groß

23.01.2015

Dank der Unterstützung der DFG im Rahmen des Sonderforschungsbereiches TR-24 können vom 17. bis zum 20. August erstmals die Physik-Projekt-Tage in der Sektion Physik der CAU Kiel stattfinden. 60 Schülerinnen aus ganz Schleswig-Holstein werden in kleinen Gruppen Forschungsprojekte durchführen und so einmal Forschungsluft schnuppern. Weitere Details zu den PPT2011, den Projekten und der Idee dahinter finden Sie unter www.ppt2011.de .

Posterpreis für Jan Carstensen

23.01.2015

Auf der "International Conference on the Physics of Dusty Plasma" wurde Jan Carstensen mit dem 'Best Poster Presentation Award' für sein Poster 'Analysis of Dust Trajectories a high Precision Diagnostic' ausgezeichnet. Das Poster fasst die bisher im Rahmen seiner Promotion in der Arbeitsgruppe Plasmadynamik (Prof. A. Piel) im Sonderforschungsbereich SFB-TR24 Greifwald-Kiel entwickelten verfeinerten Methoden zur Untersuchung der Staubdynamik in unmagnetisierten und magnetisierten staubigen Plasmen zusammen. Mit der Lieferung des 'cryofreien' 4-Tesla-Magneten 'Suleiman' im März 2011 stehen Jan Carstensen im Projekt A2 nun neue Möglichkeiten offen, seine Analysemethoden in einem weitgehend unerforschten Bereich der Staubigen Plasmen anzuwenden.

Rapid etching X-rayed

23.01.2015

A breakthrough in the study of chemical reactions during etching and coating of materials was achieved by the research group of Olaf Magnussen at the Institute of Experimental and Applied Physics. In collaboration with staff from the European Synchrotron Radiation Facility ( ESRF) in Grenoble, France the team succeeded for the first time in observing atomic-scale behaviour at material surfaces under industrial conditions. For this, the changes in the atomic arrangement at the material's surface were monitored by X-ray diffraction, which required increasing the speed of the measurements more than a hundredfold as compared to previous studies. The results appear as the cover feature in the current issue (23.3.2011) of the renowned Journal of the American Chemical Society.

Termine

Archiv

Switching of a tin-phthalocyanine: Current and Force
Förderpreis der Ralph Norwid Schindler Stiftung für Dr. Christian Hamann
Glatt gekupfert! Geebneter Weg zur Chipverdrahtung
Evidence for Chirped Auger-electron Emission
Waves in strongly coupled magnetized plasmas
Controlling spin-crossover of a single molecule
Mit Columbus im All
Successful participation of Kiel and Greifswald SFB-TR24 members in the German Physical Society Spring meeting of the Plasma Physics Division
Best Poster Prize at the Gordon-conference
Erstes Teilchenereignis auf Mars-Mission gesichtet
Geschichte der Kieler Physik und Astronomie neu erschienen
Strahlenmessung erfolgreich gestartet
November 2011
ESA-Mission Solar Orbiter
Erfolgreiche Ballonflug Kampagne
Diffusion of charged particles in strong magnetic fields
25 Sekunden in der Schwerelosigkeit
DOSIS zurück in Kiel
Discovery of a spontaneous atomic-scale magnetic skyrmion lattice in two dimensions
Poster Prize for Gerald Rohde
IEAP und ITAP schreiben Frauenförderung groß
Posterpreis für Jan Carstensen
Rapid etching X-rayed
Phys. Rev. Lett 106(2011)
Ultrafast snapshots of a photo-induced phase transition
Posterpreis für Patrick Sadler
Controlled metalation of single phthalocyanine molecules
Ultraschnelles Schmelzen geordneter Ladungsverteilungen
Poster Prize for Alexander Sperl
Dezember 2010
Auszeichnung Dr. Maik Fröhlich
November 2010
Sensor on Mars Rover to Measure Radiation Environment
Start eines Ballon Experimentes
STEREO/PLASTIC: To boldly look where no man has looked before
Forschungspreis für Prof. Magnussen
Neues Lehrbuch erschienen
PhD student workshop of the DFG priority program "Ultrafast Nanooptics" held in Sehlendorf/Kiel
Chemical Reactivity of graphene
Noise from a Single-Atom Contact
Superfluidity of nonideal bosons with dipole interaction
Nichtlineare Magnetoplasmonen in stark korrelierten Yukawa Plasmen
Licht aus Rauschen
Zum Gedenken an den Künstler Hans-Martin Ihme
Millionenzusage für Forschung mit Synchrotronstrahlung
Was haben Plasmawellen und Glühwürmchen gemeinsam?
Atomic-Scale Control of Electron Transport through Single Molecules
Hohe Anerkennung für Kieler Plasmaphysiker
Spatiotemporal control of nanooptical excitations
März 2010
Die Sonne erforschen
"How Spherical Plasma Crystals Form"
Internationales Astronomiejahr 2009
"Is diffusion anomalous in two-dimensional Yukawa liquids?"
November 2009
Oktober 2009
August 2009
Mai 2009
April 2009
März 2009
Best Poster Prize for Natalia Schneider
Forschern der TU Kaiserslautern und der Uni Kiel gelingt Schlüsselexperiment auf dem Weg zu organischen Computern
Racking up the electron billiards
Internationale Sommerschule über "Komplexe Plasmen"
Juni 2008
Mai 2008
April 2008
"Melting of trapped few particle systems"
Stabilization of the misfit layer compound (PbS)1.13TaS2 by metal cross substitution
Neues Strahlungsfrühwarnsystem für Astronauten der ISS mit Kieler Beitrag
Mechanical Properties of Silk: Interplay of Deformation on Macroscopic and Molecular Length Scales
Spectral Line Shape Variations in Time-Resolved Photoemission from a Solid
Neuigkeiten im Oktober 2007
Kieler Physiker ehren Carl Friedrich von Weizsäcker
Mission zum Mars
Förderverein & Doppelter Erfolg
Akkreditierung der neuen Studiengänge Bachelor und Master
Missionsvorschlag für eine interstellare Raumsonde
Funktion durch Schalten: Neuer SFB 677 bewilligt
Determination of the Hole Lifetime from Photoemission
Aktuelle Ergebnisse der Ag. Bauer
SOHO/CELIAS - STEREO/PLASTIC-SEPT - Workshop in Kiel
ESRF Highlight: Röntenbeugungsuntersuchungen der Ag. Magnussen
Controlled Contact to a C60 Molecule
Aktuelles
Fördergelder
Workshop "Diagnostics and Simulation of Dusty Plasmas"
Structural Properties of Screened Coulomb Balls
Lehrbuch "Introduction to Computational Methods for Many-Body Systems"
Crystallization in Two-Component Coulomb Systems
Sonderforschungsbereich-Transregio 24 "Grundlagen Komplexer Plasmen"
Shot Noise as a Probe of Spin-Polarized Transport through Single Atoms
SMP übertrifft die Erwartungen
Es ist wieder soweit - Saturday Morning Physics
Marsrover Curiosity erreicht Mount Sharp. Kieler Instrument misst neue solare Teilchenereignisse
Familie-Schindler-Förderpreis 2014 an Dr. Sven Bornholdt
Oberstufenschülerinnen experimentieren wieder bei den Physik-Projekt-Tagen
Öffentlicher Abendvortrag - Mittwoch, 3. Sept. 2014 19 Uhr - Von der Kieler Förde zum Mars
Kalender

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