PETRA III Variable Polarization XUV Beamline P04 Users Meeting 2014

12 Jun 2014, 12:30 → 13 Jun 2014, 16:30 Europe/Berlin

L202 in building 48e (DESY Hamburg)

Programme Programme

Thursday 12 June

12:30 → 13:00 Registration

13:00 → 14:30 Status reports

13:00 Facility Status PETRA III

Speaker: Oliver Seeck (DESY, FS-PE)

13:30 Report on beamline P04 at PETRA III

oral

Speaker: Jens Viefhaus (DESY, FS-PE)

14:30 → 15:00 Coffee break

Afternoon coffee break

15:00 → 16:30 User reports

15:00 ASPHERE III at P04: Towards combined momentum, spin, and position resolved photoelectron spectroscopy

oral

Speaker: Matthias Kallaene (University of Kiel)

15:30 Fast-XPS measurements for synthesis and investigation of advanced materials at beamline P04 (PETRA III, DESY).

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Speaker: Sergey Babenkov (DESY)

15:50 Graphene formation on cubic SiC - perspectives for mass production

Speaker: Victor Aristov

16:10 Advanced materials studies at P04

Oral

Speaker: Olga Molodtsova (DESY)

16:30 → 17:00 Coffee break

Coffee break

17:00 → 18:30 User reports

17:00 Opportunities for Photoemission Experiments on Deposited Size Selected Clusters at P04

Recent photoemission experiments on size selected clusters have shown interesting results. Especially the effect of clusters on the substrate band structure is disentangled. Also the chemical reactivity is traced by photoemission experiments. However the investigated systems are model systems. Future applications would require non UHV-systems. A possibility to overcome the high reactivity of clusters is to use protective cap layers or special surface templates. These systems are usually not accessible with photoelectron spectroscopy because of the low inelastic mean free path of photoelectrons. With the P04 beamline it is possible to overcome these problems because of the high photon flux and photon energy.

Speaker: Ivan Baev (Uni HH)

17:30 Magnetism of size-selected cobalt mono-, di- and trimers on Cu(100)

oral

Speaker: Torben Beeck (Institut für Experimentalphysik, Universität Hamburg)

18:00 The resonant soft x-ray diffractometer at P04: First results

oral

Speaker: Christian Schuessler-Langeheine (Helmholtz-Zentrum Berlin für Materialien und Energie GmbH)

18:30 → 20:00 Poster session

18:30 Poster session

Speaker: Various

20:00 → 22:00 Dinner

P04 Users meeting dinner

Friday 13 June

08:30 → 10:30 User reports

08:30 Innershell photoioization of atomic ions employing the photon-ion merged-beams technique at PIPE

oral

Speaker: Stefan Schippers (Justus-Liebig-Universität Gießen, Institut für Atom- und Molekülphysik)

09:00 Absorption Spectroscopy on small Molecules and metal-alloy Clusters

Oral

Speaker: Stephan Klumpp (Universität Hamburg)

09:30 COLTRIMS at P04

oral

Speaker: Till Jahnke

10:00 Photon-induced fluorescence-spectrometry experiments at the P04

Speaker: André Knie

10:30 → 11:00 Coffee break

Morning coffee break

11:00 → 13:00 User reports

11:00 Coherence measurements at P04

Speaker: Petr Skopintsev

11:30 Soft X-ray holographic Microscopy

Experiences and future plans at the beamline P04 with regard to soft X-ray holographic microscopy

Speaker: Kai Bagschik (Institute of Applied Physics)

12:00 Versatile X-ray Microscopy Endstation for the XUV Beamline P04 at PETRA III

The synchrotron radiation facility PETRA III at DESY accomodates one beamline (P04) for soft x-rays, covering the photon energy range 200 – 3000 eV and offering exceptionally high flux, high spectral resolving power (104) and variable polarization. It is thus perfectly suited for soft x-ray microscopy, but has to serve other applications as well. We developed and implemented a versatile x-ray microscopy endstation for P04, based on a modular vacuum system with especially designed high precision piezo stages for fast movements, long travel ranges and nm accuracy. The modular design allows for setting up different image acquisition modes, such as full field, stxm, fluorescence; some in addition with temporal resolution or 3d-imaging. The microscopy endstation is designed in a way that it can be set up from the blank platform placed at the beamline to full x-ray microscope operation within a few hours and disassembled in even shorter time scales, which is necessary because P04 operates in a mode that needs endstations to be exchanged on a weekly basis, depending on the users application. Thus, the versatile endstation is an “x-ray microscope on demand”, showing nevertheless the full performance needed for high resolution x-ray imaging. Imaging tests were carried out in full-field mode with photon energies between 500 and 1000 eV, demonstrating that P04 equipped with the versatile endstation can be a state-of-the-art x-ray microscopy beamline. Exposure times are short (down to 0.1 s) and the object field is – due to the installed DOE condenser – homogeneously illuminated. The high flux at P04 allows for achieving very good SNR in reasonable acquisition times. As first application XMCD microscopy experiments with high temporal resolution were performed, employing a magnetic pulser close to the sample plane and an especially designed gateable image detector, both developed by the CUI at Hamburg University. Changes of the magnetization in microscopic samples could be traced with temporal resolution < 250 ps and spatial resolution < 65 nm at photon energies around 700 – 800 eV. The high photon flux delivered at P04 enabled good SNR and very high XMCD image contrast in relatively short acquisition times. In addition, first images of interesting samples for biomedical research – for investigations of transendothelial transport mechanisms – and of specific clay minerals, in this case with spectroscopic contrast (element mapping) – for ceramic material research – have been taken with the full-field setup of the versatile x-ray microscopy endstation at P04.

Speaker: Thomas Wilhein (IXO, RheinAhrCampus Remagen, HS Koblenz)

12:30 Time-resolved soft X-ray microscopy of magnetic nanostructures at the P04 beamline of PETRA III

Oral presentation (~ 20 minutes) Abstract: Picosecond magnetization dynamics of small permalloy (Ni80Fe20) elements has been investigated with a new full-field transmission microscope at the soft X-ray beamline P04 of the high brilliance synchrotron radiation source PETRA III. The soft X-ray microscope generates a flat-top illumination field of 20 µm diameter using a grating condenser. A tilted nanostructured magnetic sample can be excited either by making use of a mobile synchronized femtosecond laser system or by a picosecond electric current pulse via a coplanar waveguide. The transmitted light of the sample plane is directly imaged by a micro zone plate with < 65 nm resolution onto a 2D gateable X-ray detector to select one particular bunch in the storage ring that probes the time evolution of the dynamic information successively via XMCD spectromicroscopy in a pump-probe scheme. In the experiments it was possible to generate a homogeneously magnetized state in patterned magnetic layers by a strong magnetic Oersted field pulse and directly observe the destruction and recovery of the initial flux-closure vortex domain patterns. On the rising edge of the magnetic field pulse, high velocities of a central vortex core were discovered exceeding 1 km/s.

Speaker: Philipp Wessels (The Hamburg Centre for Ultrafast Imaging, Universität Hamburg)

13:00 → 14:00 Lunch break

Lunch break of the P04 users meeting

14:00 → 15:30 User reports

14:00 ChemRIXS to probe the eletronic state of chemical systems in liquid phase

We present here our new designed endstation ChemRIXS for soft X-ray absorption and emission spectroscopy of chemical systems in liquid phase. The experimental results from our beamtime in Feb will be presented.

Speaker: Zhong Yin (DESY/MPIBPC)

14:30 Ptychographical imaging of biological samples at P04

Speaker: Max Rose

15:00 In-situ UHV growth studies using grazing incidence scattering

Oral

Speaker: Stephan V. Roth (DESY)

15:30 → 16:00 Open discussion and meeting summary

15:30 P04 users meeting summary

Speaker: Jens Viefhaus