R. Hartmann
A5084716937- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- CCD and CMOS Imaging Sensors
- Radiation Detection and Scintillator Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Astrophysical Phenomena and Observations
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Advanced X-ray and CT Imaging
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- Medical Imaging Techniques and Applications
- Calibration and Measurement Techniques
- Electron and X-Ray Spectroscopy Techniques
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Advanced Semiconductor Detectors and Materials
- Enzyme Structure and Function
- Nuclear physics research studies
- Adaptive optics and wavefront sensing
- Particle Accelerators and Free-Electron Lasers
- Laser-Plasma Interactions and Diagnostics
- Atomic and Subatomic Physics Research
- Photocathodes and Microchannel Plates
PNSensor (Germany)
2015-2024
Technische Universität Ilmenau
2015-2022
University of Siegen
2019
DTU Space
2016
Technical University of Denmark
2016
Perkins School for Blind
2016
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2015
Politecnico di Milano
2015
Halbleiterlabor of the Max-Planck-Society
2002-2014
Max Planck Society
1995-2012
The European Photon Imaging Camera (EPIC) consortium has provided the focal plane instruments for three X-ray mirror systems on XMM-Newton. Two cameras with a reflecting grating spectrometer in optical path are equipped MOS type CCDs as detectors (Turner [CITE]), telescope full photon flux operates novel pn-CCD an imaging spectrometer. camera system was developed under leadership of Max-Planck-Institut für extraterrestrische Physik (MPE), Garching. concept is described well different...
We present a proof-of-concept three-dimensional reconstruction of the giant mimivirus particle from experimentally measured diffraction patterns an x-ray free-electron laser. Three-dimensional imaging requires assembly many two-dimensional into internally consistent Fourier volume. Since each is randomly oriented when exposed to pulse, relative orientations have be retrieved data alone. achieve this with modified version expand, maximize and compress algorithm validate our result using new...
We demonstrate the use of an X-ray free electron laser synchronized with optical pump to obtain diffraction snapshots from photoactivated states large membrane protein complexes in form nanocrystals flowing a liquid jet.Light-induced changes Photosystem I-Ferredoxin co-crystals were observed at time delays 5 10 µs after excitation.The result correlates microsecond kinetics transfer I ferredoxin.The undocking process that follows leads rearrangements crystals will terminally lead...
We report experimental results on x-ray diffraction of quantum-state-selected and strongly aligned ensembles the prototypical asymmetric rotor molecule 2,5-diiodobenzonitrile using Linac Coherent Light Source. The experiments demonstrate first steps toward a new approach to diffractive imaging distinct structures individual, isolated gas-phase molecules. confirm several key ingredients single experiments: abilities detect count individual scattered photons in shot data, deliver...
The plasma dynamics of single mesoscopic Xe particles irradiated with intense femtosecond x-ray pulses exceeding ${10}^{16}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ from the Linac Coherent Light Source free-electron laser are investigated. Simultaneous recording diffraction patterns and ion spectra allows eliminating influence focal volume intensity particle size distribution. data show that for clusters illuminated pulses, highly charged ionization fragments in a narrow distribution...
Helium nanodroplets are considered ideal model systems to explore quantum hydrodynamics in self-contained, isolated superfluids. However, exploring the dynamic properties of individual droplets is experimentally challenging. In this work, we used single-shot femtosecond x-ray coherent diffractive imaging investigate rotation single, superfluid helium-4 containing ~10(8) 10(11) atoms. The formation vortex lattices inside confirmed by observing characteristic Bragg patterns from xenon clusters...
There exists a conspicuous gap of knowledge about the organization life at mesoscopic levels. Ultra-fast coherent diffractive imaging with X-ray free-electron lasers can probe structures relevant length scales and may reach sub-nanometer resolution on micron-sized living cells. Here we show that introduce beam aerosolised cyanobacteria into focus Linac Coherent Light Source record diffraction patterns from individual cells very low noise levels high hit ratios. We obtain two-dimensional...
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
X-ray free-electron lasers deliver intense femtosecond pulses that promise to yield high resolution diffraction data of nanocrystals before the destruction sample by radiation damage. Diffraction intensities lysozyme collected at Linac Coherent Light Source using 2 keV photons were used for structure determination molecular replacement and analyzed damage as a function pulse length fluence. Signatures are observed short 70 fs. Parametric scaling in conventional crystallography does not...
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the range 0.64 eV ≲ ma 1.17 eV. This closes gap to cosmological hot dark matter limit and actually overlaps it. From absence of excess x rays when magnet was pointing Sun we set a typical upper on axion-photon coupling gaγ 3.3 × 10(-10) GeV(-1) at 95% C.L., exact value depending pressure setting. Future direct axion searches will focus increasing sensitivity smaller values gaγ, example by...