FS-PETRA

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2019-09-02
17:02
[PUBDB-2019-03183] Journal Article
et al
Diamond nanofocusing refractive X-ray lenses made by planar etching technology
The manufacturing steps and first tests of a refractive lens made of polycrystalline diamond are described. A fabrication process based on electron-beam lithography and deep reactive ion etching is introduced. [...]
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2019-08-29
15:49
OpenAccess [PUBDB-2019-03148] Journal Article
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X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
JoVE Biology [...] 150(150), 60001 () [10.3791/60001]  GO
X-ray beam induced current (XBIC) measurements allow mapping out the nanoscale performance of electronic devices such as solar cells. Ideally, XBIC is employed simultaneously with other techniques within a multi-modal X-ray microscopy approach. [...]
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2019-08-29
02:27
OpenAccess [PUBDB-2019-03140] Journal Article
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A versatile nanoreactor for complementary in situ X-ray and electron microscopy studies in catalysis and materials science
Two in situ `nanoreactors' for high-resolution imaging of catalysts have been designed and applied at the hard X-ray nanoprobe endstation at beamline P06 of the PETRA III synchrotron radiation source. The reactors house samples supported on commercial MEMS chips, and were applied for complementary hard X-ray ptychography (23 nm spatial resolution) and transmission electron microscopy, with additional X-ray fluorescence measurements. [...]
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2019-08-10
01:32
[PUBDB-2019-02971] Journal Article

Multimodal scanning X-ray microscopy at nanoprobe endstations of fourth-generation synchrotrons
Spectroscopy 34(7), 42 - 44 ()  GO
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2019-07-04
18:33
OpenAccess [PUBDB-2019-02655] Journal Article
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Inner-shell X-ray absorption spectra of the cationic series $\mathrm{NH_y^+ ( y = 0–3)}$
Ion yields following X-ray absorption of the cationic series $\mathrm{NH_y^+ ( y = 0–3)}$ were measured to identify the characteristic absorption resonances in the energy range of the atomic nitrogen K-edge. Significant changes in the position of the absorption resonances were observed depending on the number of hydrogen atoms bound to the central nitrogen atom [...]
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ddc:540
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2019-06-25
09:30
OpenAccess [PUBDB-2019-02574] Journal Article
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Wavefront sensing at X-ray free-electron lasers
Here a direct comparison is made between various X-ray wavefront sensing methods with application to optics alignment and focus characterization at X-ray free-electron lasers (XFELs). Focus optimization at XFEL beamlines presents unique challenges due to high peak powers as well as beam pointing instability, meaning that techniques capable of single-shot measurement and that probe the wavefront at an out-of-focus location are desirable. [...]
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2019-06-03
21:21
OpenAccess [PUBDB-2019-02410] Journal Article
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Photoionization and photofragmentation of singly charged positive and negative Sc$_3$N@C$_{80}$ endohedral fullerene ions
Photoprocesses of the endohedral fullerene ions Sc$_3$N@C$_{80}^+$ and Sc$_3$N@C$_{80}^-$ in the gas phase have been investigated in the photon energy ranges 30--50 eV and 280--420 eV. Single and double ionization as well as single ionization accompanied by the release of a C$_2$ dimer were observed as a function of the photon energy for the positive parent ion and double detachment was measured for the negative parent ion. [...]
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2019-05-17
16:37
OpenAccess [PUBDB-2019-02309] Journal Article
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Multimodal X-ray imaging of grain-level properties and performance in a polycrystalline solar cell
The factors limiting the performance of alternative polycrystalline solar cells as compared with their single-crystal counterparts are not fully understood, but are thought to originate from structural and chemical heterogeneities at various length scales. Here, it is demonstrated that multimodal focused nanobeam X-ray microscopy can be used to reveal multiple aspects of the problem in a single measurement by mapping chemical makeup, lattice structure and charge collection efficiency simultaneously in a working solar cell. [...]
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2019-05-08
13:20
OpenAccess [PUBDB-2019-02182] Journal Article
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Advanced denoising for X-ray ptychography
Optics express 27(8), 10395 - 10418 () [10.1364/OE.27.010395]  GO
The success of ptychographic imaging experiments strongly depends on achieving high signal-to-noise ratio. This is particularly important in nanoscale imaging experiments when diffraction signals are very weak and the experiments are accompanied by significant parasitic scattering (background), outliers or correlated noise sources [...]
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2019-04-10
13:40
[PUBDB-2019-01922] Contribution to a book

Spatially resolved materials characterization using synchrotron radiation
Mineral reaction kinetics: Microstructures, textures, chemical and isotopic signatures, Vol. 16 London : Mineralogical Society of Great Britain & Ireland 165-180 () [10.1180/EMU-notes.16.6]  GO
The high brilliance of synchrotron radiation has allowed us to combine microscopy with X-ray analytical techniques such as X-ray fluorescence, absorption spectroscopy, and diffraction. in this way, elemental, chemical and structural information can be obtained locally and with high spatial resolution. [...]

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