Absolute X-ray energy measurement using a high-accuracy angle encoder

This paper presents an absolute X-ray photon energy measurement method that uses a Bond diffractometer. The proposed system enables the prompt and rapid in situ measurement of photon energies over a wide energy range. The diffractometer uses a reference silicon single-crystal plate and a highly accurate angle encoder called SelfA. The performance of the system is evaluated by repeatedly measuring the energy of the first excited state of the potassium-40 nuclide. The excitation energy is determined as 29829.39 (6) eV, and this is one order of magnitude more accurate than the previous measurement. The estimated uncertainty of the photon energy measurement was 0.7 p.p.m. as a standard deviation and the maximum observed deviation was 2 p.p.m.

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The New Beamline LISA at ESRF: Performances and Perspectives for Earth and Environmental Sciences

Condensed Matter ◽

10.3390/condmat4010012 ◽

2019 ◽

Vol 4 (1) ◽

pp. 12 ◽

Cited By ~ 6

Author(s):

Alessandro Puri ◽

Giovanni Lepore ◽

Francesco d’Acapito

Keyword(s):

European Synchrotron Radiation Facility ◽

Small Sample ◽

Photon Flux ◽

Wide Energy Range ◽

X Ray ◽

Chemical Treatments ◽

Wide Energy ◽

X Ray Absorption ◽

Raggi X

LISA (Linea Italiana per la Spettroscopia di Assorbimento di raggi X) is the new Italian Collaborating Research Group (CRG) beamline at the European Synchrotron Radiation Facility (ESRF) dedicated to X-ray absorption spectroscopy (XAS). The beamline covers a wide energy range, 4 < E < 90 keV, which offers the possibility for probe the K and L edges of elements that are heavier than Ca. A liquid He/N2 cryostat and a compact furnace are available for measurements in a wide temperature range (10–1000 K), allowing for in situ chemical treatments and measurements under a controlled atmosphere. The sub-millimetric beam size, the high photon flux provided, and the X-ray fluorescence detectors available (HP-Ge, SDD) allow for the study of liquid and highly diluted samples. Trace elements in geological or environmental samples can be analyzed, even for very small sample areas, gaining information on oxidation states and host phases.

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Design of an ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline

Journal of Synchrotron Radiation ◽

10.1107/s1600577513029093 ◽

2013 ◽

Vol 21 (1) ◽

pp. 273-279 ◽

Cited By ~ 9

Author(s):

L. Xue ◽

R. Reininger ◽

Y.-Q. Wu ◽

Y. Zou ◽

Z.-M. Xu ◽

...

Keyword(s):

Energy Range ◽

Energy Resolution ◽

Wide Energy Range ◽

Ultrahigh Energy ◽

Exit Slit ◽

Shanghai Synchrotron Radiation Facility ◽

X Ray ◽

Variable Line ◽

Line Spacing ◽

Wide Energy

A new ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline has been designed and is under construction at the Shanghai Synchrotron Radiation Facility. The beamline has two branches: one dedicated to angle-resolved photoemission spectroscopy (ARPES) and the other to photoelectron emission microscopy (PEEM). The two branches share the same plane-grating monochromator, which is equipped with four variable-line-spacing gratings and covers the 20–2000 eV energy range. Two elliptically polarized undulators are employed to provide photons with variable polarization, linear in every inclination and circular. The expected energy resolution is approximately 10 meV at 1000 eV with a flux of more than 3 × 1010 photons s−1at the ARPES sample positions. The refocusing of both branches is based on Kirkpatrick–Baez pairs. The expected spot sizes when using a 10 µm exit slit are 15 µm × 5 µm (horizontal × vertical FWHM) at the ARPES station and 10 µm × 5 µm (horizontal × vertical FWHM) at the PEEM station. The use of plane optical elements upstream of the exit slit, a variable-line-spacing grating and a pre-mirror in the monochromator that allows the influence of the thermal deformation to be eliminated are essential for achieving the ultrahigh-energy resolution.

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XAFS and X-MCD spectroscopies with undulator gap scan

Journal of Synchrotron Radiation ◽

10.1107/s0909049597014702 ◽

1998 ◽

Vol 5 (3) ◽

pp. 989-991 ◽

Cited By ~ 16

Author(s):

Andrei Rogalev ◽

Vincent Gotte ◽

Jose´ Goulon ◽

Christophe Gauthier ◽

Joel Chavanne ◽

...

Keyword(s):

Energy Range ◽

Absorption Spectroscopy ◽

Emission Peak ◽

Photon Statistics ◽

Wide Energy Range ◽

X Ray ◽

Polarization Rate ◽

Spin Polarized ◽

Wide Energy ◽

X Ray Absorption

The first experimental applications of the undulator gap-scan technique in X-ray absorption spectroscopy are reported. The key advantage of this method is that during EXAFS scans the undulator is permanently tuned to the maximum of its emission peak in order to maximize the photon statistics. In X-MCD or spin-polarized EXAFS studies with a helical undulator of the Helios type, the polarization rate can also be kept almost constant over a wide energy range.

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First Results from Solar Orbiter’s Energetic Particle Detector

10.5194/egusphere-egu21-15792 ◽

2021 ◽

Author(s):

Javier Rodriguez-Pacheco ◽

Keyword(s):

Energetic Particle ◽

Wide Energy Range ◽

High Temporal Resolution ◽

The Sun ◽

Particle Detector ◽

First Results ◽

Wide Energy ◽

Spatio Temporal ◽

Inner Heliosphere

<p>In this presentation, we will show the first measurements performed by EPD since the end of the commissioning phase until the latest results obtained. During these months EPD has been scanning the inner heliosphere at different heliocentric distances and heliolongitues allowing - together with other spacecraft - to investigate the&#160;spatio-temporal behavior of the particle populations in the inner&#160;heliosphere during solar minimum conditions. Solar Orbiter was launched from Cape Canaveral on February 10th, 2020, thus beginning the journey to its encounter with the Sun. Solar Orbiter carries ten scientific instruments, six remote sensing and four in situ, that will allow the mission main goal: how the Sun creates and controls the heliosphere. Among the in situ instruments, the Energetic Particle Detector (EPD) measures electrons, protons and heavy ions with high temporal resolution over a wide energy range, from suprathermal energies up to several hundreds of MeV/nucleon.</p>

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ASCA Observations of White Dwarfs, Neutron Stars and Black Holes

Symposium - International Astronomical Union ◽

10.1017/s0074180900055789 ◽

1996 ◽

Vol 165 ◽

pp. 321-331

Author(s):

H. Inoue

Keyword(s):

Black Holes ◽

Focal Plane ◽

Thin Foil ◽

Effective Area ◽

Wide Energy Range ◽

Ccd Cameras ◽

X Ray ◽

Different Types ◽

Wide Energy ◽

Large Effective Area

ASCA, the fourth Japanese X-ray astronomy satellite, was launched by the Institute of Space and Astronautical Science (ISAS) on 1993 February 20. ASCA is designed to be a high-capability X-ray observatory (Tanaka et al. 1994). It is equipped with nested thin-foil mirrors which provide a large effective area over a wide energy range from 0.5 to 10 keV. Two different types of detectors, CCD cameras (SIS) and imaging gas scintillation proportional counters (GIS) are employed as the focal plane instruments.

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Effect of H2O on the Pressure-Induced Amorphization of Hydrated AlPO4-17

Molecules ◽

10.3390/molecules24162864 ◽

2019 ◽

Vol 24 (16) ◽

pp. 2864 ◽

Cited By ~ 1

Author(s):

Frederico G. Alabarse ◽

Boby Joseph ◽

Andrea Lausi ◽

Julien Haines

Keyword(s):

Pressure Range ◽

Silicone Oil ◽

Structural Response ◽

Microporous Material ◽

X Ray ◽

Guest Species ◽

Order Of Magnitude ◽

Diamond Anvil ◽

The Stability

The incorporation of guest species in zeolites has been found to strongly modify their mechanical behavior and their stability with respect to amorphization at high pressure (HP). Here we report the strong effect of H2O on the pressure-induced amorphization (PIA) in hydrated AlPO4-17. The material was investigated in-situ at HP by synchrotron X-ray powder diffraction in diamond anvil cells by using non- and penetrating pressure transmitting media (PTM), respectively, silicone oil and H2O. Surprisingly, in non-penetrating PTM, its structural response to pressure was similar to its anhydrous phase at lower pressures up to ~1.4 GPa, when the amorphization was observed to start. Compression of the structure of AlPO4-17 is reduced by an order of magnitude when the material is compressed in H2O, in which amorphization begins in a similar pressure range as in non-penetrating PTM. The complete and irreversible amorphization was observed at ~9.0 and ~18.7 GPa, respectively, in non- and penetrating PTM. The present results show that the insertion of guest species can be used to strongly modify the stability of microporous material with respect to PIA, by up to an order of magnitude.

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A new extra-focus monochromator designed for high-performance VUV beamlines

Journal of Synchrotron Radiation ◽

10.1107/s1600577514025260 ◽

2015 ◽

Vol 22 (2) ◽

pp. 328-335 ◽

Cited By ~ 3

Author(s):

Chaofan Xue ◽

Yanqing Wu ◽

Ying Zou ◽

Lian Xue ◽

Yong Wang ◽

...

Keyword(s):

High Performance ◽

Vacuum Ultraviolet ◽

Wide Energy Range ◽

X Ray ◽

Ultraviolet Range ◽

Line Spacing ◽

Wide Energy ◽

Focus Spot ◽

Grating Monochromator ◽

Mechanical Compatibility

A new monochromator called an extra-focus constant-included-angle varied-line-spacing (VLS) cylindrical-grating monochromator (extra-focus CIA-VCGM) is described. This monochromator is based on the Hettrick–Underwood scheme where the plane VLS grating is replaced by a cylindrical one in order to zero the defocus at three reference photon energies in the vacuum-ultraviolet range. It has a simple mechanical structure and a fixed focus spot with high performance over a wide energy range. Furthermore, its mechanical compatibility with a standard VLS plane-grating monochromator allows convenient extension into the soft-X-ray range.

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Nanometer Resolution XANES Imaging of in situ switched individual PC-RAM devices

MRS Proceedings ◽

10.1557/opl.2013.643 ◽

2013 ◽

Vol 1563 ◽

Cited By ~ 1

Author(s):

Jan H. Richter ◽

Alexander V. Kolobov ◽

Paul Fons ◽

Xiaomin Wang ◽

Kirill V. Mitrofanov ◽

...

Keyword(s):

Phase Change ◽

Photon Energy ◽

Absorption Edge ◽

Crystalline State ◽

Spatial Extent ◽

Cell Type ◽

Beam Position ◽

Fluorescence Response ◽

X Ray

ABSTRACTWe report on the study of single devices of phase-change (Ge2Sb2Te5) memory cells in line cell type devices. Devices were investigated employing an x-ray nanobeam of only about 150 nm diameter, which could be fully contained within the spatial extent of the active area within a single device cell. XANES spectra showing the device in the amorphous and crystalline state have been successfully collected after switching the device in situ at the synchrotron. By monitoring the fluorescence response of the sample constituent materials at a constant photon energy (corresponding to the Ge K-edge absorption edge) as a function of x-ray beam position on the sample 2D maps have been produced.

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Nanoscale determination of interatomic distance by ptychography-EXAFS method using advanced Kirkpatrick–Baez mirror focusing optics

Journal of Synchrotron Radiation ◽

10.1107/s1600577519017004 ◽

2020 ◽

Vol 27 (2) ◽

pp. 455-461

Author(s):

Makoto Hirose ◽

Kei Shimomura ◽

Takaya Higashino ◽

Nozomu Ishiguro ◽

Yukio Takahashi

Keyword(s):

Wide Energy Range ◽

X Rays ◽

Bulk Materials ◽

Interatomic Distances ◽

X Ray ◽

Combination Technique ◽

Wide Energy ◽

Diffraction Patterns ◽

X Ray Absorption

This work demonstrates a combination technique of X-ray ptychography and the extended X-ray absorption fine structure (ptychography-EXAFS) method, which can determine the interatomic distances of bulk materials at the nanoscale. In the high-resolution ptychography-EXAFS method, it is necessary to use high-intense coherent X-rays with a uniform wavefront in a wide energy range, hence a ptychographic measurement system installed with advanced Kirkpatrick–Baez mirror focusing optics is developed and its performance is evaluated. Ptychographic diffraction patterns of micrometre-size MnO particles are collected by using this system at 139 energies between 6.504 keV and 7.114 keV including the Mn K absorption edge, and then the EXAFS of MnO is derived from the reconstructed images. By analyzing the EXAFS spectra obtained from a 48 nm × 48 nm region, the nanoscale bond lengths of the first and second coordination shells of MnO are determined. The present approach has great potential to elucidate the unclarified relationship among the morphology, electronic state and atomic arrangement of inhomogeneous bulk materials with high spatial resolution.

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