A5027225068- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallography and Radiation Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced Electron Microscopy Techniques and Applications
- Optical Coatings and Gratings
- Photorefractive and Nonlinear Optics
- Ion-surface interactions and analysis
- Ferroelectric and Piezoelectric Materials
- Photonic and Optical Devices
- Cultural Heritage Materials Analysis
- Acoustic Wave Resonator Technologies
- Surface Roughness and Optical Measurements
- Advancements in Photolithography Techniques
- Ultrasonics and Acoustic Wave Propagation
- Glass properties and applications
- Laser-Plasma Interactions and Diagnostics
- Electronic and Structural Properties of Oxides
- Advanced Surface Polishing Techniques
- Magnetic and transport properties of perovskites and related materials
- Enzyme Structure and Function
- Laser-Matter Interactions and Applications
- Nuclear Physics and Applications
- Atomic and Molecular Physics
Institut für angewandte Photonik
2018-2023
Institut für Technische und Angewandte Physik (Germany)
2023
Applied Photonics (United Kingdom)
2023
Max-Born-Institute for Nonlinear Optics and Short Pulse Spectroscopy
2016-2021
Helmholtz-Zentrum Berlin für Materialien und Energie
2011-2020
Freie Universität Berlin
2017
Physikalisch-Technische Bundesanstalt
2016
Technische Universität Berlin
2016
Deutsches Elektronen-Synchrotron DESY
1999-2013
Centre National de la Recherche Scientifique
1995-2013
X-ray spectroscopy with high spectral (up to Δλ/λ = 10−4) and spatial resolution 1 μm) is discussed. Devices based on crystals, diffraction Bragg-Fresnel elements their applications in Z- X-pinches laser plasma experiments are described.
A new instrument for simultaneous microbeam small- and wide-angle X-ray scattering fluorescence (SAXS/WAXS/XRF) is presented. The installed at the microfocus beamline BESSY II provides a beam of 10 µm size with flux about 109 photons s−1. SAXS resolution up to 500 Å d-spacing range vectors almost three orders magnitude are reached by using large-area high-resolution CCD-based detector SAXS/WAXS. particularly suited scanning SAXS/WAXS/XRF experiments on hierarchically structured biological...
Here the major upgrades of femtoslicing facility at BESSY II (Khan et al., 2006) are reviewed, giving a tutorial on how elliptical-polarized ultrashort soft X-ray pulses from electron storage rings generated high repetition rates. Employing 6 kHz femtosecond-laser system consisting two amplifiers that seeded by one Ti:Sa oscillator, total average flux photons 100 fs duration (FWHM) has been increased factor 120 to up 10(6) s(-1) (0.1% bandwidth)(-1) sample in range 250 1400 eV. Thanks new...
A combined experimental and theoretical approach reveals correlations of metal L-edge X-ray absorption energies to local charge spin densities.
L-edge spectroscopy of 3d transition metals provides important electronic structure information and has been used in many fields. However, the use this method for studying dilute aqueous systems, such as metalloenzymes, not prevalent because severe radiation damage lack suitable detection systems. Here we present spectra from a Mn solution using high-transmission zone-plate spectrometer at Linac Coherent Light Source (LCLS). The optimized discriminating signal overwhelming O K-edge...
A technology center for the production of high-precision reflection gratings has been established. Within this project a new optics beamline and versatile reflectometer at-wavelength characterization UV- XUV-reflection other (nano-) optical elements set up at BESSY-II. The Plane Grating Monochromator operated in collimated light (c-PGM) is equipped with an SX700 monochromator, which blazed (600 1200 lines mm(-1)) have recently exchanged ones improved performance produced in-house. Over...
A new Optics Beamline coupled to a versatile UHV reflectometer is successfully operating at BESSY-II. It used carry out at-wavelength characterization and calibration of in-house produced gratings novel nano-optical devices as well mirrors multilayer systems in the UV XUV spectral region. This paper presents most recent commissioning data beamline shows their correlation with initial design calculations. Special attention paid key parameters which determine quality measurements such...
For photon energies of 1 -5 keV, blazed gratings with multilayer coating are ideally suited for the suppression stray and higher orders light in grating monochromators.We developed characterized a 2000 lines/mm coated 20 period Cr/C-multilayer.The d-spacing 7.3 nm has been adapted to line distance 500 blaze angle 0.84° order provide highest efficiency energy range between 1.5 keV 3 keV.Efficiency as well reflectance witness which were simultaneously have measured.An 35% was measured at 2...
X-ray absorption spectroscopy at the L-edge of 3d transition metals provides unique information on local metal charge and spin states by directly probing 3d-derived molecular orbitals through 2p-3d transitions. However, this soft x-ray technique has been rarely used synchrotron facilities for mechanistic studies metalloenzymes due to difficulties x-ray-induced sample damage strong background signals from light elements that can dominate low signal. Here, we combine femtosecond pulses a...
A combination of a molecular beam epitaxy (MBE) machine and six circle diffractometer has been constructed at dedicated wiggler beamline the storage ring BESSY II for in situ investigations III–V compound crystal growth. The growth conditions our system reach high MBE standard with noncooled base pressure 2×10−10 mbar. fast entry load lock is available sample exchange. Large-area Be windows ultrahigh vacuum chamber allow us to measure reflections entrance exit angles up 45°, i.e., large...
Surface acoustic wave (SAW) propagation in a graphene film on the surface of piezoelectric crystals was studied at BESSY II synchrotron radiation source. Talbot effect enabled visualization SAW crystal with real time mode, and high-resolution x-ray diffraction permitted determination amplitude graphene/piezoelectric system. The influence electrical properties examined. It shown that changing enables controlling magnitude direction current crystals.
With the help of adapted off-axis reflection zone plates, near edge X-ray absorption fine structure spectra at C and N K-absorption have been recorded using a single 1.2 ns long soft pulse. The transmission experiments were performed with laser-produced plasma source in laboratory rendering time resolved measurements feasible independent on large scale facilities. A resolving power E/ΔE ∼ 950 respective edges could be demonstrated. comparison shot those collected longer measuring proves that...
We have employed soft and hard x-ray resonant magnetic scattering polarized neutron diffraction to study the interface bulk antiferromagnetic domain state of archetypal epitaxial ${\text{Ni}}_{81}{\text{Fe}}_{19}(111)/\text{CoO}(111)$ exchange biased bilayer. The combination these methods provides unprecedented detailed insights into still incomplete understanding some key manifestations bias effect. show that several orders magnitude difference between expected measured value field is...
The design for a new XUV-Optics Beamline is presented. collimated plane grating monochromator (PGM-) beamline at bending magnet setup the BESSY-II synchrotron radiation facility within framework of blazed-grating production facility. Coupled to versatile four-circle (ten axes) UHV- reflectometer as permanent end station whole dedicated at-wavelength characterization and calibration in-house produced precision gratings novel nano-optical devices well mirrors, multilayered systems etc. It also...
Blazed gratings are of dedicated interest for the monochromatization synchrotron radiation when a high photon flux is required, such as, example, in resonant inelastic X-ray scattering experiments or use laminar excluded due to too densities and expected damage, example at free-electron laser beamlines. Their availability became bottleneck since decommissioning grating manufacture facility Carl Zeiss Oberkochen. To resolve this situation new technological laboratory was established Helmholtz...
Cet article décrit les principes et modèles théoriques de nouveaux éléments optiques utilisant à la fois diffraction Bragg celle Fresnel.La sur plans successifs d'une multicouche permet d'obtenir une meilleure résolution spatiale que des miroirs conventionnels ou courbes.Les Bragg-Fresnel combinent avantages bonne spectrale réseaux type Fresnel avec stabilité multicouches.Abstract.2014 The paper describes the principles and theoretical models of new X-ray optical elements based on behaviour...
Abstract New results on the local chemical environment of Cu 2+ in archaeological Egyptian blue and green also modern were obtained by x‐ray absorption fine structure (XAFS) analysis. The information is essential for understanding colouring mechanisms both pigments. In a previous study, clear physico‐chemical characterisation was achieved using complementary analytical approach with ancient synthesized Electron microscopy (SEM–EDX TEM), diffraction micro‐Raman UV–visible spectroscopy used to...
Aiming at advancing storage-ring-based ultrafast X-ray science, over the past few years many upgrades have been undertaken to continue improving beamline performance and photon flux Femtoslicing facility BESSY II. In this article particular design upgrade of one key optical components, zone-plate monochromator (ZPM) beamline, is reported. The devoted pump/soft probe applications with 100 fs (FWHM) pulses in soft range variable polarization. A novel approach consisting an array nine off-axis...
We report on a newly built laser-based tabletop setup which enables generation of femtosecond light pulses in the XUV range employing process high-order harmonic (HHG) gas medium. The spatial, spectral, and temporal characteristics beam are presented. Monochromatization with minimum pulse distortion is central issue this work. Off-center reflection zone plates shown to be advantageous when selection desired carried out use single optical element. A cross correlation technique was applied...