1. NSLS-II Seminar

   "Considerations of accelerator design for future NSLS-II upgrade"

   Presented by Timur Shaftan, NSLS-II, Accelerator Division Director

   Friday, June 19, 2020, 12 pm
   Zoom Invitation

   Hosted by: Ignace Jarrige
2. NSLS-II Friday Lunchtime Seminar

   "Structural biology in drug discovery: Development of viral protease inhibitors"

   Presented by Scott Lovell, University of Kansas, KS

   Friday, June 12, 2020, 12 pm
   via Zoom - contact: nsls2user@bnl.gov

   Hosted by: Ignace Jarrige

   X-ray crystallography is a widely utilized technique to provide essential high resolution structural information for proteins and is particularly important to determine inhibitor binding modes for drug development. Modern advances in protein crystallization automation, synchrotron X-ray beamlines and crystallographic software development have enabled the rapid determination of crystal structures which has greatly facilitated drug discovery and development projects. Diffraction data for dozens of protein-inhibitor samples can be collected in a matter of hours and immediately analyzed for inhibitor binding using automated crystallographic software pipelines. As such, information regarding the binding modes of various inhibitors can be quickly obtained which facilitates subsequent optimization. Application of these modern structural biology techniques has been critical to the advancement of ongoing collaborative projects focused on the development of covalent inhibitors that target the 3CL proteases of Norovirus, MERS-CoV, SARS-CoV and SARS-CoV-2.
3. NSLS-II Friday Lunchtime Seminar

   "Correlating microscopic materials properties with superconducting qubit performance"

   Presented by Anjali Premkumar, Department of Electrical Engineering, Princeton University

   Friday, June 5, 2020, 12 pm
   via Zoom - contact: nsls2user@bnl.gov

   Hosted by: Ignace Jarrige

   In recent years, evidence has emerged that superconducting qubit performance is limited by imperfections in constituent materials. To characterize the microscopic character of these imperfections, we performed measurements of qubit lifetimes in parallel with structural and electron microscopy of the niobium films used in qubit fabrication. Correlations were found between qubit relaxation times and several materials properties, including grain size, oxide composition on the surface and within grain boundaries, and residual resistance. These findings represent a novel approach to understanding sources of qubit decoherence, utilizing techniques such as hard x-ray photoelectron spectroscopy and transmission electron microscopy.
4. NSLS-II Friday Lunchtime Seminar

   "Understanding the improved cycling performance of sulfurized polyacrylonitrile cathode in Li-S battery"

   Presented by Seongmin Bak, Chemistry Division, Brookhaven National Laboratory

   Friday, May 29, 2020, 12 pm
   via Zoom - contact: nsls2user@bnl.gov

   Hosted by: Ignace Jarrige

   The demands on low cost and high energy density rechargeable batteries for both transportation and large-scale stationary energy storage are stimulating more research toward new battery systems such as metal, metal-sulfur, metal-air, and multivalent batteries. Since sulfur is an earth-abundant material with low cost and has a high theoretical capacity, Li-S battery chemistry has attracted significant interest during the past decade. The Li-S battery utilizes electrochemical conversion of sulfur (S8) to lithium sulfide (Li2S), going through multiple electron transfer processes associated with long- and short-chain polysulfide (Li2Sx) intermediates. It is well known that the long-chain polysulfides can be dissolved into electrolyte with aprotic organic solvents and migrated to the Li anode side. This so-called "shuttle effect" is considered as the main reason for the capacity loss and low coulombic efficiency of the Li-S system. A lot of efforts have been made on how to overcome the problem of polysulfide dissolution through new sulfur-based material and electrolyte, as well as cell engineering. Sulfurized polyacrylonitrile (SPAN) is a promising material capable of suppressing polysulfide dissolution in Li-S batteries with carbonate-based electrolytes. However, undesirable spontaneous formation of soluble polysulfides may arise in the ether-based electrolyte, and the conversion of sulfur in SPAN during the lithiation/delithiation process is yet to be understood clearly. In this talk, our recent characterization study on the SPAN cathode material in Li-S battery using spatially-resolved X-ray fluorescence (XRF) microscopy combined with X-ray absorption spectroscopy (XAS) will be present. The morphology changes and the redistribution of sulfur and polysulfide in both the SPAN cathode and lithium metal anode were monitored through the XRF images, while the chemical state changes of SPAN and sulfur-containing interfacial layer (i.
5. NSLS-II Friday Lunchtime Seminar

   "Catalysis with XAFS and XPS at the Brazilian synchrotron: examples and perspectives"

   Presented by Daniela Coelho de Oliveira, LNLS, Brazil

   Friday, March 6, 2020, 12 pm
   NSLS-II Bldg. 743 Room 156

   Hosted by: Ignace Jarrige

   In this talk, I will present some recent results of catalysts characterization obtained at the Brazilian synchrotron using XAS and/or XPS . I will show a brief perspective of the new capabilities that are planned to attend the catalysis community as well as other research areas.
6. NSLS-II Friday Lunchtime Seminar

   "Probing the short-range spin correlations of CuGeO3 with time-resolved RIXS"

   Presented by Thorsten Schmitt, Paul Scherrer Institut, Photon Science Division, Swiss Light Source, Switzerland

   Friday, February 28, 2020, 12 pm
   NSLS-II Bldg. 743 Room 156

   Hosted by: Ignace Jarrige

   Resonant Inelastic X-ray Scattering (RIXS) has become a versatile tool for probing quantum materials, allowing simultaneous access to charge, lattice, spin and orbital degrees of freedom. Much of its success in recent years has been driven by huge improvements in instrumentation, and with the recent advent of X-ray free electron lasers such as the LCLS, it has become possible to translate this technique into the time-domain. Given its ability to address multiple degrees of freedom at once, time-resolved RIXS (trRIXS) therefore has huge potential for investigating materials with cooperative dynamics. Nevertheless, it remains technically very challenging to perform such experiments. We performed trRIXS at the oxygen K-edge in order to probe short-range spin correlations in CuGeO3. This quasi-1D material formed of chains of edge-sharing CuO4 plaquettes, displays pronounced anti-ferromagnetic (AFM) nearest-neighbor spin correlations and transitions into a spin-Peierls phase below 14 K, highlighting a close relation between magnetic and lattice sub-systems. As a result of these AFM correlations a Zhang-Rice singlet (ZRS) exciton can develop during the RIXS process, resulting in a distinct energy loss peak within the charge transfer gap. The amplitude of this ZRS exciton directly reflects the nearest-neighbor AFM correlations [1]. By photoexciting CuGeO3 across the charge gap (~4 eV) we induce a sudden reduction of the intensity of the ZRS exciton within 1 ps, which rapidly recovers before gradually decreasing again towards a stable value after ~10 ps. Comparison to equilibrium measurements and a thermal model reveal that the longer time scale dynamics are dominated by heating of the lattice. However, the initial drop and recovery of the ZRS at short time scales clearly imply a non-thermal behavior. In comparison, lower fluence data shows only a thermal component, suggesting a threshold effect. By comparison with model Hamiltonian calculations we reveal
7. NSLS-II Friday Lunchtime Seminar

   "Effect of Metal (Pt, Ir) Nuclearity in the Subnanometer Regime on CO Oxidation Activity"

   Presented by Ayman M. Karim, Department of Chemical Engineering, Virginia Polytechnic Institute and State University

   Friday, February 21, 2020, 12 pm
   NSLS-II Bldg. 743 Room 156

   Hosted by: Ignace Jarrige

   Supported noble metal catalysts are extensively used in industry and their catalytic performance is strongly affected by particle size and shape. In the last decade, supported single atoms and clusters in the subnanometer size regime have attracted a lot of interest since they maximize the metal utilization and have also shown extraordinary catalytic properties for many reactions. However, to tailor the catalyst properties for specific reactions and determine possible limitations, there is a need to understand, on the atomic scale, the origin of reactivity in the subnanometer regime. In this seminar, I will present my group's efforts in understanding the role of metal nuclearity and electronic properties in catalyzing CO oxidation as a model reaction. Using a suite of advanced characterization techniques (aberration-corrected electron microscopy, microcalorimetry, in-situ and in-operando DRIFTS, XPS, EXAFS and HERFD-XANES) complemented by DFT calculations and detailed kinetics measurements, the catalyst structural and electronic properties are identified and correlated with the reaction kinetics. In the talk, CO oxidation on Ir and Pt single atoms and subnanometer clusters supported on MgAl2O4 and CeO2, respectively, will be presented. We identified the active Ir and Pt single atom complexes and show that the reaction follows a combination of Eley-Rideal and Mars-van Krevelen mechanisms. Moreover, we show that despite considered a non-reducible support, CO oxidation on MgAl2O4 supported Ir subnanometer clusters follows a similar mechanism as on a reducible oxide where O2 is activated at the metal-support interface. Finally, the role of metal-support interaction in O2 activation and effect of CO binding strength on the catalytic activity will be discussed.
8. NSLS-II Colloquium

   "Subsurface Landscapes of Oxidation and Reaction in the Critical Zone"

   Presented by Susan Brantley, Pennsylvania State University, PA

   Thursday, February 13, 2020, 4 pm
   Large Seminar Room, Bldg. 510

   Hosted by: John Hill

   The globally ubiquitous mineral pyrite oxidizes even at low oxygen concentrations. As the most common crustal sulfide, pyrite reactivity impacts sulfur, iron, oxygen, and carbon budgets globally. We discovered that pyrite oxidizes completely at tens of meters depth even in low-porosity rocks in catchments in humid climates. As erosion exposes the pyrite to near-surface conditions in low porosity rocks, pore and fracture development is the main control on the rate of oxidative weathering. Between fractures, oxygen diffusion limits the weathering and oxidation is inferred to be largely abiotic because bacteria cannot enter rock matrix pores. Oxygen concentrations and erosion rates together can explain pyrite-derived sulfate fluxes in rivers to the ocean and may account for the presence or absence of pyrite in detrital sediments over Earth history.
9. NSLS-II Friday Lunchtime Seminar

   "Tracing Processes Involving the Reactive Intermediates of To Better Understand the Role of Sulfur Cycling on the Fate of Arsenic and Iron in Sediments; Using Reactive Intermediates to Document Extensive Cryptic Sulfur Cycling Affecting Arsenic Levels"

   Presented by BENJAMIN C. BOSTICK, Columbia University, Palisades, NY

   Friday, January 31, 2020, 12 pm
   NSLS-II Bldg. 743 Room 156

   Hosted by: Ignace Jarrige

   Arsenic (As) groundwater contamination is thought to result from the reductive dissolution of As-bearing iron oxides by microorganisms. Our understanding of the how reactions occur commonly depends on observing the consumption and production of reactants and products respectively. This approach can be insufficient in environmental systems containing complex compositions and phases that can react through multiple and distinct coupled biological and chemical processes. We suggest it is more effective to study environmental processes by considering dissolved and mineral species as reactive intermediates in geochemical cycles where their concentration is controlled by the balance between their production, consumption and transport. Here, we apply this approach to elucidate a critical role of sulfur (S) cycling in iron reduction in sediments affected by As contamination. Arsenic (As) contamination in soil and groundwater is commonly associated with iron reduction because the concentration of dissolved As and Fe(II) increase together as Fe(III) minerals convert to Fe(II) minerals. In contrast, sulfate concentrations are usually low and stable in groundwaters affected by As. This stability is often interpreted as evidence for the minimal role of S cycling in Fe reduction; however, there is mounting biochemical and mineralogical evidence that sulfate reduction is active and critical to both Fe(III) reduction and As mobilization. Sediment iron mineralogies indicate that reactive Fe(III) minerals are present in most sediments and this Fe(III) is particularly susceptible to chemical and biological reduction. These Fe minerals were transformed to Fe(II) carbonate, green rusts, and, rarely, iron sulfides as the sediments became reduced. The microorganisms identified in sediments undergoing reduction were not iron reducers, and often were autotrophs involved in S cycling. This data suggests that sulfate reduction is active, and tightly coupled to the oxidation of sulfide and elem
10. NSLS-II Friday Lunchtime Seminar

    "Real-space Local Correlated Motion in Liquids studied by using Inelastic Scattering"

    Presented by Yuya Shinohara, Oak Ridge National Laboratory

    Friday, January 17, 2020, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Liquids are critical to our daily life. A paramount example is water, which covers 70% of the Earth's surface and make up about 80% of our body. Liquids are also crucial to many current energy technologies. Despite their importance, our understanding of liquids at the atomic level is much poorer than that for crystalline solids. Particularly elusive is a detailed description of the correlated dynamics in liquids, which is the key to controlling the transport properties of liquids. Recent progress in inelastic X-ray/neutron scattering makes it possible to obtain inelastic scattering spectra over a wide energy transfer (E) and momentum transfer (Q) with a high E- and Q-resolution within a reasonable amount of time. This enables us to calculate the Van Hove correlation functions via Fourier transform. With this novel approach, we have determined spatial and temporal correlations of molecular motion of liquids. In this presentation, I will present our recent efforts in understanding the real-space local correlated motion in liquids.
11. CSI Q Seminar

    "Probing quantum entanglement at the Electron Ion Collider"

    Presented by Dmitri Kharzeev, Stony Brook University and BNL

    Wednesday, December 18, 2019, 1:30 pm
    Training Room, Bldg 725

    Hosted by: Layla Hormozi

    The structure functions measured in deep-inelastic scattering are related to the entropy of entanglement between the region probed by the virtual photon and the rest of the hadron. This opens new possibilities for experimental and theoretical studies using the Electron Ion Collider. The real-time evolution of the final state in deep-inelastic scattering can be addressed with quantum simulations using the duality between high energy QCD and the Heisenberg spin chain.
12. NSLS-II Friday Lunchtime Seminar

    "Operation at 500mA average current on the horizon"

    Presented by Alexei Blednykh, NSLS-II

    Friday, December 6, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Igna

    500mA average current achieved in NSLS-II. Limitations on the total average current will be discussed in details. Localized heating of the vacuum components was the major issue. Since the heating issues were resolved we were able to demonstrate 500mA during the beam study time. However, for the regular operation @500mA we need more power from the RF system to compensate the synchrotron radiation losses produced by the bending magnets, present and future insertion devices. To mitigate the heating issue and increase the beam stability, bunch lengthening will be beneficial for NSLS-II.
13. NSLS-II Friday Lunchtime Seminar

    "In Situ & ACERT - The LANL-BNL Cathode Collaboration"

    Presented by John Smedley, Los Alamos National Laboratory

    Friday, November 22, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    The Applied Cathode Enhancement and Robustness Technologies (ACERT) capability at LANL and the in-situ x-ray analysis growth chamber at BNL are two of the premier tools available for development of photocathode technologies. We are following a model of innovation and collaboration to move cathodes from lab to application, guided by theory, modeling, and experimental validation. This presentation will focus on two recent technology advances – cathodes with "atomic armor", single monolayers of coatings to the cathode surface and/or substrate to improve lifetime and enable operating in inferior vacuum, and highly crystalline CsTe, providing evidence that better crystallinity can improve QE while supporting an ultra-smooth surface. We hope to engender both technical discussion in these areas and open the door to future collaborations. LA-UR-19-28272
14. NSLS-II Friday Lunchtime Seminar

    "Local structures of Sn-doped BCZT lead-free ferroelectrics"

    Presented by Frederick Peter Marlton, Aarhus University, Denmark

    Friday, November 15, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige
15. NSLS-II Friday Lunchtime Seminar

    "Underpinning the nuclear fuel cycle with synchrotron and laboratory based X-ray absorption spectroscopy"

    Presented by Neil Hyatt, University of Sheffield, United Kingdom

    Friday, November 8, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Nuclear energy provides about 30% of the world's low carbon electricity supply, from more than 450 civil nuclear reactors. The supporting nuclear fuel cycle comprises a suite of industrial processes, which transform uranium ore into nuclear fuel, and support reactor operations, decommissioning, waste management, and geological disposal. This seminar will highlight three case studies in the application of X-ray absorption spectroscopy (XAS) in the nuclear fuel cycle, embracing environmental contamination, nuclear forensics, and radioactive waste management. In addition to exploitation of state of the art micro-focus multi-modal beamlines at synchrotron light sources, I will also show how we are using new developments in laboratory based XAS instrumentation, to probe element speciation in nuclear materials.
16. CSI Q Seminar

    "Many-body physics with atoms and molecules under quantum control"

    Presented by Sebastain Will, Columbia University

    Thursday, November 7, 2019, 3 pm
    Conference room 201, Bldg 734

    Hosted by: Layla Hormozi

    Over the past decade, quantum simulators based on ultracold atoms have emerged as a powerful tool to address open questions in strongly interacting systems and nonequilibrium quantum dynamics that have relevance in all areas of physics, from strongly correlated materials to cosmology. Today, quantum simulators based on ultracold dipolar molecules are within experimental reach, which exploit long-range dipole-dipole interactions and will give access to new classes of strongly correlated many-body systems. In this talk, I will present our efforts towards quantum simulation with ultracold dipolar molecules. In trailblazing experiments we have demonstrated the creation of ultracold molecules via atom-by-atom assembly, which yields complete control over the molecular degrees of freedom, including electronic, vibrational, rotational, and nuclear spin states. Exploiting this control, we have observed long nuclear spin coherence times in molecular ensembles, which makes ultracold molecules an interesting candidate for the realization of a long-lived quantum memory. In addition, the dipole-dipole interactions between molecules can be flexibly tuned via external electrostatic and microwave fields. This motivates our current work towards two-dimensional systems of strongly interacting molecules, which promises access to novel quantum phases, will enable high-speed simulation of quantum magnetism, and points towards potential quantum computing schemes based on ultracold molecules. In the end, I will briefly present our new project on enhancing quantum coherence by dissipation in programmable atomic arrays. For this effort we will develop a novel nanophotonic platform that will enable trapping of individual atoms in optical tweezer arrays with unprecedented accuracy and high-speed tunability.
17. NSLS-II Friday Lunchtime Seminar

    "Disentangling the nematode-microbiome interactions underlying long-term different crop rotation systems"

    Presented by Kaile Zhang, University of Florida

    Friday, October 25, 2019, 12:30 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Integrating two years of bahiagrass (Paspalum notatum) into conventional peanut (Arachis hypogea L.) and cotton (Gossypium hirsutum L.) cropping systems (bahiagrass-bahiagrass- peanut-cotton) improves soil quality and crop production compared with the conventional peanut-cotton-cotton rotation (CR). However, it is unclear if this system, known as a sod-based rotation (SBR), affects interactions within soil biota and if such interactions affect nutrient cycling and soil fertility. In this study, we collected soils from long-term plots under CR and SBR (located in Quincy, FL), before cotton planting. Our results showed that the metabolic activities of relative low trophic groups (i.e., bacterivores and herbivores) were positively correlated with r-strategists irrespective of cropping systems, but negatively with k-strategists only under CR. These demonstrated that microbial communities under higher rotational diversity contributed larger to C, energy, and nutrient flows in soil food webs relative to CR. Compared with SBR, one or more functional nematodes groups were entirely missing or showed few abundances, and less evenness of the microbial community was exhibited under CR in spite of no significant differences between these twoKo systems. These results imply that SBR with greater rotational diversity induced higher soil community diversity and consequently sustains the distribution of soil biological community, with positive effects on soil nutrient availability and the control of plant parasites.
18. NSLS-II Friday Lunchtime Seminar

    "Plant-fungal symbiosis and their potential impacts on terrestrial biogeochemistry"

    Presented by Ko-Hsuan (Koko) Chen, University of Florida

    Friday, October 25, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Fungi are associated with all lineages of land plants. While plant-fungal symbiosis is common, many of their interactions, ranging from mutualism, commensalism, to parasitism are yet to be determined. As plant-fungal symbiosis are tightly linked to nutrient cycling, different interaction types have substantial impacts on biogeochemistry. Here, we will use two plant-fungal symbiosis examples: 1) Pine and their ectomycorrhizal fungi, and 2) mosses and their associated fungi, to illustrate how considering plant-fungal interaction and biogeochemistry together can further our understanding toward a better understanding of plant-fungal biology.
19. NSLS-II Friday Lunchtime Seminar

    "Imaging antiferromagnetic domains using x-ray Bragg phase contrast at CSX beamline"

    Presented by Valery Kiryukhin, Rutgers University, New Jersey

    Friday, October 4, 2019, 10:30 am
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    We review our recent experiments on imaging antiphase antiferromgnetic domains at CSX-1. The technique utilizes interference effects revealing the domain boundaries. The measurements produce direct images, and are done in real time.
20. NSLS-II Friday Lunchtime Seminar

    "Crystal Engineering of Lanthanide Metal-Organic Frameworks (Ln-MOFs): A Rational pproach to Designing Materials with Targeted Applications"

    Presented by Zeyar Min, Univ of the West Indies, Mona Campus, Jamaica

    Friday, September 27, 2019, 12:30 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Metal-organic frameworks (MOFs) are hybrid organic/inorganic structures with well-defined topologies which feature metal ions or clusters bridged by rigid organic linkers and have attracted immense interest for their catalytic, sensing, magnetic and adsorption properties among others. Their high porosity (surface areas of up to 7000 m2/g) can be exploited to encapsulate a wide variety of guest molecules and numerous possibilities for tunable characteristics arise from careful manipulation of both the organic and inorganic components. One of the crystal engineering approaches of MOFs is reticular synthesis and enables rational design and assembly of novel porous materials by utilizing building blocks with varying structures and functionalities to attain certain desired physical and chemical properties. However, reticular synthesis using lanthanide metals ions as building blocks is disinclined due to their high coordination numbers and unpredictable coordination chemistry. Herein, a new approach to the crystal engineering of Ln-MOFs, their ratiometric tunable luminescence properties and ability to sense metal ions and components of nitroaromatic explosives is presented.
21. NSLS-II Friday Lunchtime Seminar

    "Quantum Computing on crystalline beams of ions: the concept and proof-of-principle experiments"

    Presented by Timur Shaftan, NSLS-II

    Friday, September 27, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    One of the promising directions in Quantum Computers (QC) is based on using ion traps. In a modern QC, several tens of ions are collected in an electromagnetic trap of a cm in size, with their motion cooled down to micro K temperature level, leading to entanglement of their quantum states, controlled by laser and RF fields. These ions = qubits then used to run quantum computations at unprecedent rate using specialized codes (check, for example, QuTip, Quantum Toolbox in Python). I will discuss a concept of a QC, which holds a promise to support 105 of qubits in contrast to the state-of-the-art devices. The idea is to use crystalline beams of ions in an accelerator as the medium for qubits. The crystalline beams were demonstrated in storage rings in 1980s when many protons, being cooled with electron beam formed a revolving ring with crystalline-like structure inside. Marrying this concept with that of the QC on a conventional ion trap, one might consider expansion of the QC to a large particle accelerator with high qubit capacity. The latter is important for expansion of QC capabilities, including the processing power and robustness against errors due to decoherence. In this presentation I will go over the concept and my analysis of a few challenges that require proof-of-principal experiments so that the some basic aspects of this interesting concept are validated.
22. NSLS-II Friday Lunchtime Seminar

    "Non-trivial Spin Textures in Ferromagnetic Hetero-Interfaces"

    Presented by Ramesh C Budhani, Department of Physics, Morgan State University, Baltimore, MD

    Friday, September 20, 2019, 12:30 pm
    NSLS-II Bldg. 743 Room 156
23. NSLS-II Friday Lunchtime Seminar

    "Towards Real Time Characterization of Grain Growth from the Melt"

    Presented by Christopher Wright, Department of Applied Physics and Applied Mathematics, Columbia University

    Friday, September 20, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Single crystal materials have unique properties which are endowed by their long ranging atomic order. Growing these crystalline materials can be difficult, as entropy favors disordered grains and the growth dynamics are poorly understood, leaving the process of making crystals prone to trial and error and limiting its application in the broader research community. In my talk I will discuss our work elucidating the microstructural dynamics of floating zone growth using x-ray scattering techniques. One focus of this work is building the computational infrastructure to process the large stream of heterogeneous data which results from these techniques. These pieces of infrastructure are then used to characterize the growth of Rutile crystals via a float zone furnace. Particular attention is paid to the competition amongst the grains, and how certain grains are selected from the plethora which are created at the beginning of the growth.
24. NSLS-II Colloquium

    "Theoretical Understanding of Photon Spectroscopies in Correlated Materials In and Out of Equilibrium"

    Presented by Thomas Devereaux, SLAC

    Thursday, September 12, 2019, 4 pm
    Large Seminar Room, Bldg. 510

    Hosted by: John Hill

    Pending
25. NSLS-II Friday Lunchtime Seminar

    "Coherent X-ray Scattering Studies of Surface Processes: Self-Organized Ion Beam Nanopatterning"

    Presented by Karl Ludwig, Boston University, MA

    Friday, August 23, 2019, 12 pm
    NSLS-II Bldg. 743 Room 156

    Hosted by: Ignace Jarrige

    Karl Ludwig*, Mahsa Mokhtarzadeh*, Jeffrey Ulbrandt#, Peco Myint*, Suresh Narayanan+, and Randall Headrick# *Boston University / #University of Vermont +Advanced Photon Source, Argonne National Laboratory Enabled by the continued increases in brilliance available from synchrotron x-ray sources, our goal is to develop coherent x-ray scattering as a powerful new tool for the investigation of surface dynamics during growth and patterning processes. In particular, our research has been developed new approaches in X-ray Photon Correlation Spectroscopy (XPCS), using it to examine the dynamics of kinetic roughening in amorphous thin film growth, the step structure evolution in polycrystalline epitaxial growth and self-organized ion beam nanopatterning. Broad-beam low-energy ion bombardment can lead to the spontaneous formation of nanoscale surface structures, but the dominant mechanisms driving evolution remain controversial. Here I will describe our studies of the classic case of ion-beam rippling of SiO2 surfaces, in which we examine the relationship between the average kinetics of ripple formation and the underlying ?uctuation dynamics. In the early stage growth of ?uctuations we find a novel behavior with memory stretching back to the beginning of the bombardment. For a given length scale, correlation times do not grow signi?cantly beyond the characteristic time associated with the early-stage ripple growth. In the late stages of patterning, when the average surface structure on a given length scale is no longer evolving, dynamical processes continue on the surface. Nonlinear processes dominate at long length scales, leading to compressed exponential decay of the speckle correlation functions, while at short length scales the dynamics appears to approach a linear behavior consistent with viscous ?ow relaxation. This behavior is found to be consistent with simulations of a recent nonlinear growth model. In addition
26. NSLS-II Seminar

    "2019 NSLS-II Summer Intern Mini-Symposium"

    Presented by John Hill, Welcome & will introduce 11 speaker, Interns with NSLS-II

    Thursday, August 1, 2019, 1 pm
    Large Seminar Room, Bldg. 510

    Hosted by: Lisa Miller

    Will forward flyer upon request (morello@bnl.gov)

Currently showing events from the past year. See all past events »

1. NSLS-II and CFN Users' Meeting

   May 18-20, 2020
2. LiX Solution Scattering Workbench 2020

   February 13-15, 2020
3. Short Course on X-ray Absorption Fine Structure: Theory, Data Analysis and Modeling (XAFS 2019)

   November 13-15, 2019
4. Exploring New Science Frontiers at NSLS-II

   October 21-23, 2019
5. LiX Solution Scattering Workbench (2019-3)

   September 23-25, 2019
6. Teacher Training: Exploring Proteins with a New Light

   July 1-3, 2019
7. 11th International Conference on Inelastic X-ray Scattering (IXS2019)

   June 23-28, 2019
8. 4th International Conference on Resonant Elastic X-ray Scattering (REXS 2019)

   June 17-21, 2019
9. LiX Solution Scattering Workbench

   May 29-31, 2019
10. 2019 NSLS-II & CFN Joint Users' Meeting

    May 20-22, 2019
11. In Celebration of International Women's Day 2019

    March 8, 2019
12. LiX Solution Scattering Workbench

    February 14-16, 2019
13. Short Course: Introduction to X-ray Absorption Spectroscopy

    November 6-8, 2018
14. NOBUGS 2018: New Opportunities for Better User Group Software

    October 22-26, 2018
15. NSLS-II Pair Distribution Function School 2018

    September 17-19, 2018
16. 10th International Workshop on X-ray Radiation Damage to Biological Samples

    September 13-14, 2018
17. Coherence 2018: International Workshop on Phase Retrieval and Coherent Scattering

    June 24-28, 2018
18. 2018 NSLS-II and CFN Users' Meeting

    May 21-23, 2018
19. Data Analysis and Modeling of XANES and EXAFS Spectra: Applications to Nanomaterials

    November 1-3, 2017
20. Synchrotron Environmental Science Symposium 7: Illuminating the Links Between Environmental Science and Human Health

    October 30 - November 1, 2017
21. 2017 NSLS-ll and CFN Users' Meeting

    May 15-17, 2017
22. High-Brightness Synchrotron Light Source Workshop

    April 26-27, 2017
23. X-ray Absorption Fine Structure Spectroscopy (XAFS) Short Course: Principles and Applications

    November 2-4, 2016
24. 14th International Conference on Surface X-ray and Neutron Scattering (SXNS14)

    July 10-14, 2016
25. 2016 NSLS-ll and CFN Users' Meeting

    May 23-25, 2016
26. Short Course: Advanced Topics in XAFS Data Analysis and Modeling

    November 5-7, 2015
27. 8th International Workshop on Infrared Microscopy and Spectroscopy using Accelerator Based Sources

    October 11-15, 2015
28. Collaboration Meeting on "Simulation and Modeling for SR Sources and X-Ray Optics"

    October 1-2, 2015
29. NSLS-II Strategic Planning Workshop

    September 24-25, 2015
30. 23rd International Congress on X-ray Optics and Microanalysis (ICXOM23)

    September 14-18, 2015
31. Complementary Methods in X-ray Spectroscopic, Structural, and Imaging Techniques

    July 13-14, 2015
32. 12th International Conference on Synchrotron Radiation Instrumentation (SRI 2015)

    July 6-10, 2015
33. BES Facilities Computing Working Group Meeting - May 21-22, 2015

    May 21-22, 2015
34. 2015 NSLS-II & CFN Joint Users' Meeting

    May 18-20, 2015
35. First Science at the ABBIX Beamlines

    April 21-22, 2015
36. Short Course: Methods and Applications of X-Ray Absorption Fine Structure Spectroscopy

    November 13-15, 2014
37. NSLS "Last Light"

    September 30, 2014
38. Remote Access Data Collection: Automation and Robotics at the SSRL Protein Crystallography Beam Lines

    July 17-18, 2014
39. Joint NSLS/NSLS-II & CFN Users' Meeting

    May 19-21, 2014
40. X9 SAXS Workbench

    April 24-27, 2014
41. Industrial Research at NSLS-II

    April 8-9, 2014
42. X6A Workbench: Hands-on Synchrotron Structural Biology

    February 25-28, 2014
43. X6A Workbench: Hands-on Synchrotron Structural Biology

    October 29 - November 1, 2013
44. In-situ Methods of X-ray Absorption Spectroscopy

    October 24-26, 2013
45. NSLS-II Early Experiment Workshop: IXS Focused Session

    October 1, 2013
46. NSLS-II First-Experiments Workshop

    August 12-13, 2013
47. X6A Workbench: Hands-on Synchrotron Structural Biology

    June 25-28, 2013
48. NSLS and CFN Users' Meeting

    May 20-22, 2013
49. Seventh International Workshop on Radiation Safety at Synchrotron Radiation Sources

    May 8-10, 2013
50. RapiData 2013

    April 21-26, 2013
51. X9 SAXS Workbench

    April 18-21, 2013
52. MXLS13 "New Opportunities for Magnetic Dynamics and Materials at NSLS-II and MAX-IV”

    March 24-28, 2013
53. X6A Celebrates Its 10th Anniversary!

    February 1, 2013
54. X6A Workbench: Hands-on Synchrotron Structural Biology

    January 28 - February 1, 2013
55. XANES Short Course: Theory, Analysis, Applications

    November 8-10, 2012
56. X9 SAXS Workbench

    September 20-23, 2012
57. Rock & Cell: From the Meso- to the Nanoscale with X-ray Spectromicroscopy

    September 17-18, 2012
58. X9 SAXS Workbench

    June 21-24, 2012
59. Crystallography Workbench

    June 11-13, 2012
60. Synchrotron Radiation in Art and Archaeology

    June 5-8, 2012
61. Synchrotron Radiation in Art and Archaeology (SR2A)

    June 5-8, 2012
62. 2012 NSLS/CFN Joint Users' Meeting

    May 21-23, 2012
63. Operando IV

    4th International Congress on Operando Spectroscopy

    April 29 - May 3, 2012
64. 4th International Congress on Operando Spectroscopy

    April 29 - May 3, 2012
65. Joint InSynC-INCREASE Workshop

    April 18-19, 2012
66. X6A Workbench: Hands-on Synchrotron Structural Biology

    March 27-30, 2012
67. X9 SAXS Workbench

    March 8-10, 2012
68. XAFS Short Course: Introduction to the Experiment, Data Analysis and Modeling

    November 3-5, 2011
69. X9 SAXS Workbench

    October 13-16, 2011
70. Photon Sciences Users' Executive Committee and Town Meetings

    August 12, 2011
71. Materials Diffraction Suite Workshop

    July 18-20, 2011
72. 2011 NSLS/CFN Users' Meeting

    May 23-25, 2011
73. Workshop on Supercritical Carbon Dioxide-Materials Interactions

    March 21-23, 2011
74. Advanced Topics in XAFS Data Modeling

    November 4-6, 2010
75. EPICS Collaboration Meeting - Fall 2010

    October 7-14, 2010
76. 2010 Joint NSLS and CFN Users Meeting

    May 24-26, 2010
77. In Situ and Operando XAFS Experiments and Data Analysis

    October 22-24, 2009
78. MX Frontiers at the One Micron Scale

    July 23-24, 2009
79. The Experimental Program to Stimulate Competitive Research (EPSCoR) Review 2009

    July 20-23, 2009
80. INCREASE Workshop

    Interdisciplinary Consortium for Research and Educational Access in Science and Engineering

    July 15-17, 2009
81. International Workshop for New Opportunities in Hard X-ray Photoelectron Spectroscopy: HAXPES 2009

    May 20-22, 2009
82. 2009 NSLS / CFN Users' Meeting

    May 18-20, 2009
83. Applications of Synchrotron Techniques in Glass Research

    April 6-7, 2009