1
|
Grimes M, Atlan C, Chatelier C, Bellec E, Olson K, Simonne D, Levi M, Schülli TU, Leake SJ, Rabkin E, Eymery J, Richard MI. Capturing Catalyst Strain Dynamics during Operando CO Oxidation. ACS NANO 2024. [PMID: 39009584 DOI: 10.1021/acsnano.4c04127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
Understanding the strain dynamic behavior of catalysts is crucial for the development of cost-effective, efficient, stable, and long-lasting catalysts. Using time-resolved Bragg coherent diffraction imaging at the fourth generation Extremely Brilliant Source of the European Synchrotron (ESRF-EBS), we achieved subsecond time resolution during operando chemical reactions. Upon investigation of Pt nanoparticles during CO oxidation, the three-dimensional strain profile highlights significant changes in the surface and subsurface regions, where localized strain is probed along the [111] direction. Notably, a rapid increase in tensile strain was observed at the top and bottom Pt {111} facets during CO adsorption. Moreover, we detected oscillatory strain changes (6.4 s period) linked to CO adsorption during oxidation, where a time resolution of 0.25 s was achieved. This approach allows for the study of adsorption dynamics of catalytic nanomaterials at the single-particle level under operando conditions, which provides insight into nanoscale catalytic mechanisms.
Collapse
Affiliation(s)
- Michael Grimes
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Clément Atlan
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Corentin Chatelier
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Ewen Bellec
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Kyle Olson
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - David Simonne
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
- SOLEIL, L'Orme des Merisiers Départementale 128, 91190 Saint-Aubin, France
| | - Mor Levi
- Department of Materials Science and Engineering, Technion-Israel Institute of Technology, 3200003 Haifa, Israel
| | - Tobias U Schülli
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Steven J Leake
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Eugen Rabkin
- Department of Materials Science and Engineering, Technion-Israel Institute of Technology, 3200003 Haifa, Israel
| | - Joël Eymery
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
| | - Marie-Ingrid Richard
- Univ. Grenoble Alpes, CEA Grenoble, IRIG, MEM, NRX, 17 rue des Martyrs, F-38000 Grenoble, France
- ESRF - The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| |
Collapse
|
2
|
Dresselhaus-Marais LE, Kozioziemski B, Holstad TS, Ræder TM, Seaberg M, Nam D, Kim S, Breckling S, Choi S, Chollet M, Cook PK, Folsom E, Galtier E, Gonzalez A, Gorkhover T, Guillet S, Haldrup K, Howard M, Katagiri K, Kim S, Kim S, Kim S, Kim H, Knudsen EB, Kuschel S, Lee HJ, Lin C, McWilliams RS, Nagler B, Nielsen MM, Ozaki N, Pal D, Pablo Pedro R, Saunders AM, Schoofs F, Sekine T, Simons H, van Driel T, Wang B, Yang W, Yildirim C, Poulsen HF, Eggert JH. Simultaneous bright- and dark-field X-ray microscopy at X-ray free electron lasers. Sci Rep 2023; 13:17573. [PMID: 37845245 PMCID: PMC10579415 DOI: 10.1038/s41598-023-35526-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Accepted: 05/19/2023] [Indexed: 10/18/2023] Open
Abstract
The structures, strain fields, and defect distributions in solid materials underlie the mechanical and physical properties across numerous applications. Many modern microstructural microscopy tools characterize crystal grains, domains and defects required to map lattice distortions or deformation, but are limited to studies of the (near) surface. Generally speaking, such tools cannot probe the structural dynamics in a way that is representative of bulk behavior. Synchrotron X-ray diffraction based imaging has long mapped the deeply embedded structural elements, and with enhanced resolution, dark field X-ray microscopy (DFXM) can now map those features with the requisite nm-resolution. However, these techniques still suffer from the required integration times due to limitations from the source and optics. This work extends DFXM to X-ray free electron lasers, showing how the [Formula: see text] photons per pulse available at these sources offer structural characterization down to 100 fs resolution (orders of magnitude faster than current synchrotron images). We introduce the XFEL DFXM setup with simultaneous bright field microscopy to probe density changes within the same volume. This work presents a comprehensive guide to the multi-modal ultrafast high-resolution X-ray microscope that we constructed and tested at two XFELs, and shows initial data demonstrating two timing strategies to study associated reversible or irreversible lattice dynamics.
Collapse
Affiliation(s)
- Leora E Dresselhaus-Marais
- Department of Materials Science & Engineering, Stanford University, Stanford, CA, USA.
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA, USA.
| | | | - Theodor S Holstad
- Department of Physics, Technical University of Denmark, Lyngby, Denmark
| | | | | | - Daewoong Nam
- Photon Science Center, Pohang University and Science and Technology, Pohang, Korea
- XFEL Beamline Department, Pohang Accelerator Laboratory, Pohang University and Science and Technology, Pohang, Korea
| | - Sangsoo Kim
- XFEL Beamline Department, Pohang Accelerator Laboratory, Pohang University and Science and Technology, Pohang, Korea
| | | | - Sungwook Choi
- Department of Physics, Sogang University, Seoul, Korea
| | | | - Philip K Cook
- University of Natural Resources and Life Sciences, BOKU, Vienna, Austria
- European Synchrotron Radiation Facility, Grenoble, France
| | - Eric Folsom
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Eric Galtier
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | | | - Tais Gorkhover
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- University of Hamburg, Hamburg, Germany
| | - Serge Guillet
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | | | | | - Kento Katagiri
- Department of Materials Science & Engineering, Stanford University, Stanford, CA, USA
- Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Seonghan Kim
- XFEL Beamline Department, Pohang Accelerator Laboratory, Pohang University and Science and Technology, Pohang, Korea
| | - Sunam Kim
- XFEL Beamline Department, Pohang Accelerator Laboratory, Pohang University and Science and Technology, Pohang, Korea
| | - Sungwon Kim
- Department of Physics, Sogang University, Seoul, Korea
| | - Hyunjung Kim
- Department of Physics, Sogang University, Seoul, Korea
| | | | - Stephan Kuschel
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
- Institute of Nuclear Physics, Technical University of Darmstadt, Darmstadt, Germany
| | - Hae Ja Lee
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - Chuanlong Lin
- Center for High Pressure Science & Technology Advanced Research, Shanghai, China
| | | | - Bob Nagler
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | | | - Norimasa Ozaki
- Graduate School of Engineering, Osaka University, Osaka, Japan
| | - Dayeeta Pal
- Department of Materials Science & Engineering, Stanford University, Stanford, CA, USA
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - Ricardo Pablo Pedro
- Department of Nuclear Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Alison M Saunders
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA, USA
| | - Frank Schoofs
- UK Atomic Energy Authority, Culham Science Centre, Abingdon, UK
| | - Toshimori Sekine
- Center for High Pressure Science & Technology Advanced Research, Shanghai, China
| | - Hugh Simons
- Department of Physics, Technical University of Denmark, Lyngby, Denmark
| | - Tim van Driel
- SLAC National Accelerator Laboratory, Menlo Park, CA, USA
| | - Bihan Wang
- Center for High Pressure Science & Technology Advanced Research, Shanghai, China
| | - Wenge Yang
- Center for High Pressure Science & Technology Advanced Research, Shanghai, China
| | - Can Yildirim
- European Synchrotron Radiation Facility, Grenoble, France
- Université Grenoble Alpes, CEA, Grenoble, France
| | | | - Jon H Eggert
- Physics Division, Lawrence Livermore National Laboratory, Livermore, CA, USA
| |
Collapse
|
3
|
Performance Evaluation of Deep Neural Network Model for Coherent X-ray Imaging. AI 2022. [DOI: 10.3390/ai3020020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
We present a supervised deep neural network model for phase retrieval of coherent X-ray imaging and evaluate the performance. A supervised deep-learning-based approach requires a large amount of pre-training datasets. In most proposed models, the various experimental uncertainties are not considered when the input dataset, corresponding to the diffraction image in reciprocal space, is generated. We explore the performance of the deep neural network model, which is trained with an ideal quality of dataset, when it faces real-like corrupted diffraction images. We focus on three aspects of data qualities such as a detection dynamic range, a degree of coherence and noise level. The investigation shows that the deep neural network model is robust to a limited dynamic range and partially coherent X-ray illumination in comparison to the traditional phase retrieval, although it is more sensitive to the noise than the iteration-based method. This study suggests a baseline capability of the supervised deep neural network model for coherent X-ray imaging in preparation for the deployment to the laboratory where diffraction images are acquired.
Collapse
|
4
|
Vicente R, Neckel IT, Sankaranarayanan SKS, Solla-Gullon J, Fernández PS. Bragg Coherent Diffraction Imaging for In Situ Studies in Electrocatalysis. ACS NANO 2021; 15:6129-6146. [PMID: 33793205 PMCID: PMC8155327 DOI: 10.1021/acsnano.1c01080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Accepted: 03/18/2021] [Indexed: 05/05/2023]
Abstract
Electrocatalysis is at the heart of a broad range of physicochemical applications that play an important role in the present and future of a sustainable economy. Among the myriad of different electrocatalysts used in this field, nanomaterials are of ubiquitous importance. An increased surface area/volume ratio compared to bulk makes nanoscale catalysts the preferred choice to perform electrocatalytic reactions. Bragg coherent diffraction imaging (BCDI) was introduced in 2006 and since has been applied to obtain 3D images of crystalline nanomaterials. BCDI provides information about the displacement field, which is directly related to strain. Lattice strain in the catalysts impacts their electronic configuration and, consequently, their binding energy with reaction intermediates. Even though there have been significant improvements since its birth, the fact that the experiments can only be performed at synchrotron facilities and its relatively low resolution to date (∼10 nm spatial resolution) have prevented the popularization of this technique. Herein, we will briefly describe the fundamentals of the technique, including the electrocatalysis relevant information that we can extract from it. Subsequently, we review some of the computational experiments that complement the BCDI data for enhanced information extraction and improved understanding of the underlying nanoscale electrocatalytic processes. We next highlight success stories of BCDI applied to different electrochemical systems and in heterogeneous catalysis to show how the technique can contribute to future studies in electrocatalysis. Finally, we outline current challenges in spatiotemporal resolution limits of BCDI and provide our perspectives on recent developments in synchrotron facilities as well as the role of machine learning and artificial intelligence in addressing them.
Collapse
Affiliation(s)
- Rafael
A. Vicente
- Chemistry
Institute, State University of Campinas, 13083-970 Campinas, São Paulo, Brazil
- Center
for Innovation on New Energies, University
of Campinas, 13083-841 Campinas, São Paulo, Brazil
| | - Itamar T. Neckel
- Brazilian
Synchrotron Light Laboratory, Brazilian
Center for Research in Energy and Materials, 13083-970, Campinas, São Paulo, Brazil
| | - Subramanian K.
R. S. Sankaranarayanan
- Department
of Mechanical and Industrial Engineering, University of Illinois, Chicago, Illinois 60607, United States
- Center
for Nanoscale Materials, Argonne National
Laboratory, Argonne, Illinois 60439, United
States
| | - José Solla-Gullon
- Institute
of Electrochemistry, University of Alicante, Apartado 99, E-03080 Alicante, Spain
| | - Pablo S. Fernández
- Chemistry
Institute, State University of Campinas, 13083-970 Campinas, São Paulo, Brazil
- Center
for Innovation on New Energies, University
of Campinas, 13083-841 Campinas, São Paulo, Brazil
| |
Collapse
|
5
|
Nanoscale Mapping of Heterogeneous Strain and Defects in Individual Magnetic Nanocrystals. CRYSTALS 2020. [DOI: 10.3390/cryst10080658] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We map the three-dimensional strain heterogeneity within a single core-shell Ni nanoparticle using Bragg coherent diffractive imaging. We report the direct observation of both uniform displacements and strain within the crystalline core Ni region. We identify non-uniform displacements and dislocation morphologies across the core–shell interface, and within the outer shell at the nanoscale. By tracking individual dislocation lines in the outer shell region, and comparing the relative orientation between the Burgers vector and dislocation lines, we identify full and partial dislocations. The full dislocations are consistent with elasticity theory in the vicinity of a dislocation while the partial dislocations deviate from this theory. We utilize atomistic computations and Landau–Lifshitz–Gilbert simulation and density functional theory to confirm the equilibrium shape of the particle and the nature of the (111) displacement field obtained from Bragg coherent diffraction imaging (BCDI) experiments. This displacement field distribution within the core-region of the Ni nanoparticle provides a uniform distribution of magnetization in the core region. We observe that the absence of dislocations within the core-regions correlates with a uniform distribution of magnetization projections. Our findings suggest that the imaging of defects using BCDI could be of significant importance for giant magnetoresistance devices, like hard disk-drive read heads, where the presence of dislocations can affect magnetic domain wall pinning and coercivity.
Collapse
|
6
|
Yang D, Phillips NW, Hofmann F. Mapping data between sample and detector conjugated spaces in Bragg coherent diffraction imaging. JOURNAL OF SYNCHROTRON RADIATION 2019; 26:2055-2063. [PMID: 31721751 DOI: 10.1107/s160057751901302x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 09/20/2019] [Indexed: 06/10/2023]
Abstract
Bragg coherent X-ray diffraction imaging (BCDI) is a non-destructive, lensless method for 3D-resolved, nanoscale strain imaging in micro-crystals. A challenge, particularly for new users of the technique, is accurate mapping of experimental data, collected in the detector reciprocal space coordinate frame, to more convenient orthogonal coordinates, e.g. attached to the sample. This is particularly the case since different coordinate conventions are used at every BCDI beamline. The reconstruction algorithms and mapping scripts composed for individual beamlines are not readily interchangeable. To overcome this, a BCDI experiment simulation with a plugin script that converts all beamline angles to a universal, right-handed coordinate frame is introduced, making it possible to condense any beamline geometry into three rotation matrices. The simulation translates a user-specified 3D complex object to different BCDI-related coordinate frames. It also allows the generation of synthetic coherent diffraction data that can be inserted into any BCDI reconstruction algorithm to reconstruct the original user-specified object. Scripts are provided to map from sample space to detector conjugated space, detector conjugated space to sample space and detector conjugated space to detector conjugated space for a different reflection. This provides the reader with the basis for a flexible simulation tool kit that is easily adapted to different geometries. It is anticipated that this will find use in the generation of tailor-made supports for phasing of challenging data and exploration of novel geometries or data collection modalities.
Collapse
Affiliation(s)
- David Yang
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
| | - Nicholas W Phillips
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
| | - Felix Hofmann
- Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
| |
Collapse
|
7
|
Beane G, Devkota T, Brown BS, Hartland GV. Ultrafast measurements of the dynamics of single nanostructures: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2019; 82:016401. [PMID: 30485256 DOI: 10.1088/1361-6633/aaea4b] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The ability to study single particles has revolutionized nanoscience. The advantage of single particle spectroscopy measurements compared to conventional ensemble studies is that they remove averaging effects from the different sizes and shapes that are present in the samples. In time-resolved experiments this is important for unraveling homogeneous and inhomogeneous broadening effects in lifetime measurements. In this report, recent progress in the development of ultrafast time-resolved spectroscopic techniques for interrogating single nanostructures will be discussed. The techniques include far-field experiments that utilize high numerical aperture (NA) microscope objectives, near-field scanning optical microscopy (NSOM) measurements, ultrafast electron microscopy (UEM), and time-resolved x-ray diffraction experiments. Examples will be given of the application of these techniques to studying energy relaxation processes in nanoparticles, and the motion of plasmons, excitons and/or charge carriers in different types of nanostructures.
Collapse
Affiliation(s)
- Gary Beane
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States of America
| | | | | | | |
Collapse
|
8
|
Three-dimensional X-ray diffraction imaging of dislocations in polycrystalline metals under tensile loading. Nat Commun 2018; 9:3776. [PMID: 30224669 PMCID: PMC6141512 DOI: 10.1038/s41467-018-06166-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Accepted: 08/22/2018] [Indexed: 11/18/2022] Open
Abstract
The nucleation and propagation of dislocations is an ubiquitous process that accompanies the plastic deformation of materials. Consequently, following the first visualization of dislocations over 50 years ago with the advent of the first transmission electron microscopes, significant effort has been invested in tailoring material response through defect engineering and control. To accomplish this more effectively, the ability to identify and characterize defect structure and strain following external stimulus is vital. Here, using X-ray Bragg coherent diffraction imaging, we describe the first direct 3D X-ray imaging of the strain field surrounding a line defect within a grain of free-standing nanocrystalline material following tensile loading. By integrating the observed 3D structure into an atomistic model, we show that the measured strain field corresponds to a screw dislocation. Identifying atomic defects during deformation is crucial to understand material response but remains challenging in three dimensions. Here, the authors couple X-ray Bragg coherent diffraction imaging and atomistic simulations to correlate a strain field to a screw dislocation in a single copper grain.
Collapse
|
9
|
Cherukara MJ, Sasikumar K, DiChiara A, Leake SJ, Cha W, Dufresne EM, Peterka T, McNulty I, Walko DA, Wen H, Sankaranarayanan SKRS, Harder RJ. Ultrafast Three-Dimensional Integrated Imaging of Strain in Core/Shell Semiconductor/Metal Nanostructures. NANO LETTERS 2017; 17:7696-7701. [PMID: 29086574 DOI: 10.1021/acs.nanolett.7b03823] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Visualizing the dynamical response of material heterointerfaces is increasingly important for the design of hybrid materials and structures with tailored properties for use in functional devices. In situ characterization of nanoscale heterointerfaces such as metal-semiconductor interfaces, which exhibit a complex interplay between lattice strain, electric potential, and heat transport at subnanosecond time scales, is particularly challenging. In this work, we use a laser pump/X-ray probe form of Bragg coherent diffraction imaging (BCDI) to visualize in three-dimension the deformation of the core of a model core/shell semiconductor-metal (ZnO/Ni) nanorod following laser heating of the shell. We observe a rich interplay of radial, axial, and shear deformation modes acting at different time scales that are induced by the strain from the Ni shell. We construct experimentally informed models by directly importing the reconstructed crystal from the ultrafast experiment into a thermo-electromechanical continuum model. The model elucidates the origin of the deformation modes observed experimentally. Our integrated imaging approach represents an invaluable tool to probe strain dynamics across mixed interfaces under operando conditions.
Collapse
Affiliation(s)
- Mathew J Cherukara
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Kiran Sasikumar
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Anthony DiChiara
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Steven J Leake
- ESRF - The European Synchrotron , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Wonsuk Cha
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Eric M Dufresne
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Tom Peterka
- Mathematics and Computer Science, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Ian McNulty
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Donald A Walko
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Haidan Wen
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | | | - Ross J Harder
- Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States
| |
Collapse
|