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18th International Conference on High Pressure Science and Technology

作者： James Badro Guilla Fiquet Francois Guyot Michael Krisch Alain Mermet Herwig Requardt Abhay Shukla Jean-Pascal Kueff Florent Occelli Viktor Struzhkin Ho-kwang Mao Laboratoire de Mineralogie-Cristallographie CNRS4 place Jussieu75252 Paris cedex 05France Laboratoire de Mineralogie-Cristallographie CNRS4 place Jussieu75252 Paris cedex 05France Laboratoire de Mineralogie-Cristallographie CNRS4 place Jussieu75252 Paris cedex 05France ESRF BP 220 GrenobleFrance ESRF BP 220 GrenobleFrance ESRF BP 220 GrenobleFrance ESRF BP 220 GrenobleFrance ESRF BP 220 GrenobleFrance CEA-DAM Bruyeres-le-Chatel France arnegie Institution Washington DCUSA arnegie Institution Washington DCUSA

＜正＞High pressure research has entered the era of high-end state of the art measurements, especially in the field of synchrotron x-ray research. Nowadays, a large number of techniques are readily available and applicable in conjunction with the most widely used high pressure apparatus, namely the diamond anvil cell. In the past years, diffraction constituted the largest part of high-pressure synchrotron-based x-ray research, along with limited efforts in the field of x-ray absorption spectroscopy. The appearance of high-energy third generation x-ray sources （ESRF, APS, SPring-8） allowed extremely brilliant x-ray beams to be focused down to very small sizes, due to the conjunction of high flux, small source size and divergence, and high coherence. With the help of an x-ray spectrometer set up in the Rowland geometry （figure 1） and low-Z （x-ray transparent） gaskets, a wide variety of high-resolution spectroscopic techniques can be accessed. We will briefly present techniques such as high resolution x-ray emission as local probe for magnetism and electronic modifications, as well as resonant x-ray scattering （x-ray Raman）. Inelastic x-ray scattering with ultra-high resolution allows us to access the vibrational properties （acoustic and optical phonons） of materials. These new techniques allowed us to investigate the electronic and magnetic properties of wiistite （FeO）, hematite （Fe2O3） and iron （Fe） well into the megabar pressure range. FeO is shown to become a paramagnetic compound at high pressure, and a closed-loop anti-ferromagnetic stability domain is depicted [1]. The vibrational properties （longitudinal and transverse sound wave velocities, and optical phonons in some cases） of iron （Fe） [2] and iron-bearing compounds （FeSi, FeS, FeS2, and FeO） [3-4] were measured to megabar pressures by ultra-high resolution （4 meV） inelastic x-ray scattering, along with the acoustic phonon dispersion curves. This set of data provides the first d

关键词： High Pressure x-ray spectroscopy Phonons Electronic Structure Magnetism

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On joint analysing xMM-NuSTAR spectra of active galactic nuclei

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中国科学技术大学学报 2024年第7期54卷 19-33,18,I0002页

作者： Jialai Kang Junxian Wang CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China

A recently released xMM-Newton note revealed a significant calibration issue between nuclear spectroscopic telescope array(NuSTAR)and xMM-Newton European Photon Imaging Camera(EPIC)and provided an empirical correction to the EPIC effective *** quantify the bias caused by the calibration issue in the joint analysis of xMM-NuSTAR spectra and verify the effectiveness of the correction,in this work,we perform joint-fitting of the NuSTAR and EPIC-pn spectra for a large sample of 104 observation pairs of 44 x-ray bright active galactic nuclei(AGN).The spectra were extracted after requiring perfect simultaneity between the xMM-Newton and NuSTAR exposures(merging good time intervals(GTIs)from two missions)to avoid bias due to the rapid spectral variability of the *** the correction,the EPIC-pn spectra are systematically harder than the corresponding NuSTAR spectra by■subsequently yielding significantly underestimated cutoff energy E_(cut)and the strength of reflection component R when performing *** confirm that the correction is highly effective and can commendably erase the discrepancy in best-fitΓ,E_(cut),and *** thus urge the community to apply the correction when joint-fitting xMM-NuSTAR spectra,but note that the correction is limited to 3–12 keV and therefore not applicable when the soft x-ray band data are ***,we show that as merging GTIs from two missions would cause severe loss of NuSTAR net exposure time,in many cases,joint-fitting yields no advantage compared with utilizing NuSTAR data ***,We present a technical note on filtering periods of high background flares for xMM-Newton EPIC-pn exposures in the small window(SW)mode.

关键词： active galactic nuclei x-ray spectroscopy xMM-Newton NuSTAR cross-calibration issue

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Interfacial electronic interaction enabling exposed Pt(110)facets with high specific activity in hydrogen evolution reaction

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Nano Research 2023年第1期16卷 174-180页

作者： Sicong Qiao Qun He Quan Zhou Yuzhu Zhou Wenjie xu Hongwei Shou Yuyang Cao Shuangming Chen xiaojun Wu Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Science at the Microscale Collaborative Innovation of Center of Chemistry for Energy Materials(iChEM)School of Chemistry and Materials SciencesUniversity of Science and Technology of ChinaHefei 230026China

To achieve a complete industrial chain of hydrogen energy,the development of efficient electrocatalysts for hydrogen evolution reaction(HER)is of great ***,a nickel nitride supported platinum(Pt)catalyst with highly exposed Pt(110)facets(Pt_((110))-Ni_(3)N)is obtained for catalyzing *** x-ray spectra and density functional theory studies demonstrate that the interfacial electronic interaction between Pt and Ni3N support can promote the hydrogen evolution on Pt(110)facets by weakening hydrogen *** a result,the Pt_((110))-Ni_(3)N catalyst delivers an obviously higher specific activity than commercial 20 wt.%Pt/C in acidic *** work suggests that the suitable interface modulation may play a vital role in rationally designing advanced electrocatalysts.

关键词： Interfacial electronic interaction hydrogen evolution reaction x-ray spectroscopy Pt(110)facets density functional theory

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Spatially-resolved spectroscopic diagnosing of aluminum wire array Z-pinch plasmas on QiangGuang-I facility

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Chinese Physics B 2010年第7期19卷 377-381页

作者：叶凡李正宏秦义蒋树庆薛飞彪杨建伦徐荣昆金永杰 Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Key Laboratory of Particle and Radiation Imaging Tsinghua University Department of Engineering Physics Tsinghua University

Spatially-resolved crystal spectrometers with a high spectral resolution are developed to diagnose K-shell x-ray radiation from Z-pinch plasmas. These diagnostic apparatuses are successfully applied to aluminum wire array Z-pinch experiments on QiangGuang-I facility, a driver with a pulsed current up to about 1.5 MA in 80 ns. Time-integrated experimental results show that the K-shell x-ray emission lines of aluminum Z-pinch plasmas are dominated by line emissions from helium-like ionisation state. Bright spots that might have higher electron temperature or density are produced randomly in location and size along the z-axis during implosions. According to the experimental data, the electron temperature and the ion density are estimated to be between 250 eV and 310 eV, and between 7.0× 10^19 cm-3 and 4.0 ×10^19 cm-3 respectively, while the ion temperature is inferred to be about 10.2 keV, which is much higher than the electron temperature.

关键词： Z-pinch wire array x-ray spectroscopy spatially-resolved crystal spectrometer

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K-Shell Spectra from CH-Tamped Aluminum Layers Irradiated with Intense Femtosecond Laser Pulses

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Chinese Physics Letters 2010年第9期27卷 143-146页

作者：熊刚赵阳尚万里胡智民朱托韦敏习杨国洪张继彦杨家敏 Research Center of Laser Fusion China Academy of Engineering Physics PO Box 919-986 Mianyang 621900

x-ray spectra of H-like and He-like aluminum ions from aluminum buried in CH layers irradiated with 30fs, 200 TW laser are measured. The electron temperature and density are derived from line ratios of the He-α resonance line to its satellite lines. Typical temperatures of 490-646 eV and electron densities up to 7 × 10^20 cm-3 are obtained. The results show that the electron density increases and temperature decreases with the increasing CH thickness.

关键词： ALUMINUM FEMTOSECOND lasers ELECTRONIC pulse techniques x-ray spectroscopy ELECTRON temperature ELECTRON distribution THICKNESS measurement

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Phase Structures of （K0.48Na0.52）0.945Li0.055Sb0.05Nb0.95O3 Piezoceramics

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Chinese Physics Letters 2010年第1期27卷 242-244页

作者：臧国忠仪修杰徐志军付鹏赵利民蒲锡鹏 School of Materials Science and Engineering Liaocheng University Liaocheng 252059

The phase structures of lead-free （K0.48Na0.52）0.945Li0.055Sb0.05Nb0.95O3 piezoceramics are studied based on the measurements of ferroelectric and dielectric properties as well as the analyses of x-ray diffraction pattern and energy dispersive spectroscopy. The poled samples exhibit orthorhombic structure whereas the surface and interior for unpoled samples exhibit tetragonal and tetragonal-orthorhombic coexistent structures, respectively. These results are in agreement with the relative permittivity-temperature curves and demonstrate that phase transitions can be induced by Na volatilization and poling process. The remnant polarization Pr measured at 20°C increases continuously with the increase of electric field in the range of 2000-4000V/mm. This indicates that the polymorphic structure is more beneficial to the rotation or reorientation of dipoles than either the orthorhombic or the tetragonal structure. The randomly oriented domains may be the essential reason for the continuous rotation or reorientation and not good thermal stability.

关键词： PIEZOELECTRIC ceramics CHEMICAL structure x-ray diffraction DIELECTRICS x-ray spectroscopy PHASE transformations (Physics) MAGNETIC dipoles

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Development of new diagnostics based on LiF detector for pump-probe experiments

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Matter and Radiation at Extremes 2018年第4期3卷 197-206页

作者： T.Pikuz A.Faenov NOzaki T.Matsuoka B.Albertazzi N.J.Hartley K.Miyanishi K.Katagiri S.Matsuyama K.Yamauchi H.Habara Y.Inubushi T.Togashi H.Yumoto H.Ohashi Y.Tange T.Yabuuchi M.Yabashi A.N.Grum-Grzhimailo A.Casner I.Skobelev S.Makarov S.Pikuz G.Rigon M.Koenig K.A.Tanaka T.Ishikawa R.Kodama Graduate School of Engineering Osaka UniversitySuitaOsaka 565-0871Japan Joint Institute for High Temperatures Russian Academy of SciencesMoscow 125412Russia Open and Transdisciplinary Research Initiatives Osaka UniversitySuitaOsaka 565-0871Japan Photon Pioneers Center Osaka UniversitySuitaOsaka 565-0871Japan LULI e CNRS Ecole PolytechniqueCEA:Universite Paris-SaclayUPMC Univ Paris 06:Sorbonne Universites-F-91128 Palaiseau cedexFrance Helmholtz-Zentrum Dresden-Rossendorf Dresden 01328Germany Japan Synchrotron Radiation Research Institute Sayo-choSayo-gunHyogo 679-5198Japan RIKEN Spring-8 Center Sayo-choSayo-gunHyogo 679-5148Japan Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State UniversityMoscow 119991Russia Universite de Bordeaux-CNRS-CEA CELIA(Center Lasers Intenses et Applications)UMR 5107F-33405 TalenceFrance National Research Nuclear University MEPhI Moscow 115409Russia ELI-NP/IFN-HH Maqurele-Bucharest 077125 Romania ILE Osaka UniversitySuitaOsaka 565-0871Japan

We present new diagnostics for use in optical laser pump-x-ray Free Electron Laser(xFEL)probe experiments to monitor dimensions,intensity profile and focusability of the xFEL beam and to control initial quality and homogeneity of targets to be driven by optical laser *** developing x-ray imaging,based on the use of an LiF crystal detector,we were able to measure the distribution of energy inside a hard x-ray beam with unprecedented high spatial resolution(~1 mm)and across a field of view larger than some *** diagnostic can be used in situ,provides a very high dynamic range,has an extremely limited cost,and is relatively easy to be implemented in pump-probe *** proposed methods were successfully applied in pump-probe experiments at the SPring-8 Angstrom Compact free electron LAser(SACLA)xFEL facility and its potential was demonstrated for current and future High Energy Density Science experiments.

关键词： xFEL Shock waves Pump-probe experiments High energy density science x-ray spectroscopy x-ray imaging

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Oxygen Recovery in Hf Oxide Films Fabricated by Sputtering

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Chinese Physics Letters 2009年第5期26卷 195-198页

作者：蒋然李子峰 School of Physics Shandong University Ji'nan 250100

The chemical structure of ultrathin Hf oxide films （〈 10 nm） fabricated by a standard sputtering method is investigated using x-ray spectroscopy and Rutherford backseattering spectroscopy. According to the experiments, oxygen species are impacted to the HfO2/Si interface during the initial sputtering, and then released back to the upper HfO2 region driven by the oxygen concentration grads. A vacuum annealing can greatly enhance this recovery process. Additionally, significant SiO2 reduction in the interface is observed after the vacuum annealing for the thick HfO2 films in our experiment. It might be an effective method to confine the interracial layer thickness by sputtering thick HfO2 in no-oxygen ambient.

关键词： OxYGEN MICROFABRICATION HAFNIUM oxide THIN films SPUTTERING (Physics) x-ray spectroscopy INTERFACES (Physical sciences) VACUUM technology

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Structural, elemental, optical and magnetic study of Fe doped ZnO and impurity phase formation

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Progress in Natural Science:Materials International 2014年第2期24卷 142-149页

作者： S.Karamat R.S.Rawat P.Lee T.L.Tan R.V.Ramanujan Natural Science and Science Education National Institute of Education Nanyang Technological University COMSATS Institute of Information Technology Department of Physics Middle East Technical University School of Material Science and Engineering Nanyang Technological University Nanyang Avenue

We have prepared a series of(ZnO)1-x(Fe2O3)x≤0.10bulk samples with various concentrations of Fe dopant by ball milling and investigated their structural, compositional, optical and magnetic properties by means of x-ray diffraction(xRD), x-ray photoelectron spectroscopy(xPS),Raman spectrometer and vibrating sample magnetometer(VSM), respectively. Information about different impurity phases was obtained through Rietveld refinements of xRD data analysis. xPS results showed different valence states(Fe2+ tand Fe3+) supported by shaking satellite peaks in samples. With increasing Fe doping percentage, the crystal quality deteriorated and a shift of E2 low band(characteristic of ZnO) has been observed in Raman spectra. Energy band gap estimated from reflectance UV–vis spectroscopy showed shift for all bulk samples. The magnetic behavior was examined using a vibrating sample magnetometer(VSM), indicating ferromagnetic behavior at room temperature(300 K). The effective magnetic moment per Fe atom decreases with increase in doping percentage which indicates that ferromagnetic behavior arises from the substitution of Fe ions in the ZnO lattice.

关键词： Fe doped ZnO Dilute magnetic semiconductor Rietveld refinements x-ray spectroscopy Band gap Magnetic moment

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Magnetic and Relativistic Effects in Uranium Catalysts and the Movement of Charged Particles under the Effect of Electric and Magnetic Fields

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Journal of Chemistry and Chemical Engineering 2014年第10期8卷 996-1000页

作者： Aibassov Erkin Zhakenovich Yemelyanova Valentina Stepanovna Shakieva Tatyana Vladimirovna Tussupbaev Nesipbay Kuandykovich Imanbaev Klysh Bulenbayev Maxat Zhumabaevich Research Institute of New Chemical Technologies and Materials Kazakh National University Al-Farabi Almaty 005012 Kazakhstan

We first received and examined x-ray spectroscopy of uranium catalyst. We studied magnetic and relativistic effects in uranium catalysts, and the movement of charged particles under the effect of a uniform electric field and uniform magnetic field. We proposed the mechanism of the motion of charged particles under the influence of a uniform electric field and a uniform magnetic field.

关键词： Preparation of uranium catalyst x-ray spectroscopy nanoparticles.

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