BEGIN:VCALENDAR
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PRODID:-//IXAS: The International X-ray Absorption Society - ECPv6.15.15//NONSGML v1.0//EN
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METHOD:PUBLISH
X-ORIGINAL-URL:https://xrayabsorption.org
X-WR-CALDESC:Events for IXAS: The International X-ray Absorption Society
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BEGIN:VTIMEZONE
TZID:UTC
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TZOFFSETFROM:+0000
TZOFFSETTO:+0000
TZNAME:UTC
DTSTART:20190101T000000
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END:VTIMEZONE
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200713
DTEND;VALUE=DATE:20200715
DTSTAMP:20260718T165830
CREATED:20200522T144512Z
LAST-MODIFIED:20200720T012040Z
UID:430-1594598400-1594771199@xrayabsorption.org
SUMMARY:Wantana Klysubun: XAS capability and science at the Thailand synchrotron
DESCRIPTION:
URL:https://xrayabsorption.org/events/journalclub-wantana-klysubun/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200716
DTEND;VALUE=DATE:20200717
DTSTAMP:20260718T165830
CREATED:20200621T134547Z
LAST-MODIFIED:20200720T012215Z
UID:486-1594857600-1594943999@xrayabsorption.org
SUMMARY:Hao Yuan:  Ptychography and 4D imaging by spectro-ptycho-tomography
DESCRIPTION:Coherent X-ray scattering (diffraction) methods will be key to exploiting the high coherent flux of 4th generation synchrotron sources. Ptychography is a coherent diffraction technique that allows rapid\, reliable inversion of arrays of diffraction images into real space images by using overlapping spatial areas to constrain the reconstruction [1]. While ptychography is quite well developed in the hard X-ray regime and in electron and optical microscopy\, the implementation of soft X-ray ptychography is in its infancy. Soft X-ray ptychography is a coherent diffraction imaging technique readily implemented in Scanning Transmission X-ray Microscopy (STXM) [2]. 4D imaging by soft X-ray ptychography – chemically specific\, quantitative 3D mapping of nanostructures can provide insight into the physical and chemical properties. By measuring spectro-ptycho-tomography – 2D ptychographic images at multiple photon energies and multiple tilt angles – 3D chemical distribution can be derived [3]. \nReferences: \n\nPfeiffer F. X-ray ptychography. Nature Photonics\, 2018\, 12(1): 9-17. https://doi.org/10.1038/s41566-017-0072-5\n\nShapiro D A\, Yu Y S\, Tyliszczak T\, et al. Chemical composition mapping with nanometre resolution by soft X-ray microscopy. Nature Photonics\, 2014\, 8(10): 765-769. \nWu J\, Zhu X\, Shapiro D A\, et al. Four-dimensional imaging of ZnO-coated alumina aerogels by scanning transmission X-ray microscopy and ptychographic tomography. The Journal of Physical Chemistry C\, 2018\, 122(44): 25374-25385. https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.8b07363\n\n\n 
URL:https://xrayabsorption.org/events/journalclub-hao-yuan/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200720
DTEND;VALUE=DATE:20200722
DTSTAMP:20260718T165830
CREATED:20200621T134914Z
LAST-MODIFIED:20200727T030541Z
UID:488-1595203200-1595375999@xrayabsorption.org
SUMMARY:Li Song: Soft X-ray endstaions at the Hefei Light Source and some applications of XAS
DESCRIPTION:Hefei Light Source (HLS) is the first dedicated synchrotron radiation facility in China with electron ring energy of 0.8 Gev\, which is located on the West Campus of the University of Science and Technology of China (USTC). With the completion of twice constructions and recent upgradation\, HLS become a fully upgraded soft X-ray synchrotron radiation facility\, now operating ten experimental stations (Infrared Spectroscopy and Microspectroscopy\, Combustion and Flame\, Mass Spectrometry\, Soft X-ray Microscopy\, Spectral Radiation Standard and Metrology\, Atomic & Molecular Physics\, Photoemission Spectroscopy\, Catalysis and Surface Science\, X-Ray Magnetic Circular Dichroism\, Angle-resolved Photoemission Spectroscopy) [1]. The well-designed beamlines and experimental stations at HLS\, together with the Shanghai synchrotron Radiation Facility and the Beijing Synchrotron Radiation Facility\, allow us to perform cutting edge scientific experiments. Here\, I will briefly introduce the soft X-ray endstations at HLS\, and present our recent studies based on X-ray absorption techniques. In particular\, two progress will be discussed: (1) adopt the rational atom-binding strategy and develop the method of precise nano-confined synthesis\, subsequently establish the structure-property relationships in several functional nanomaterials anchored with single atoms by combining synchrotron XAS and XPS [2-5]; (2) propose the controllable ion-intercalating and ion-exchanging strategies and develop the method of in-situ reconstructed synthesis\, eventually clarify the working mechanism of cation-/anion-modulated functional nanomaterials by the means of operando XAS with synchrotron-on-line devices[6-9]. \n  \nReferences: \n\nhttp://en.nsrl.ustc.edu.cn/main.htm\n\nAtomically dispersed platinum supported on curved carbon supports for efficient electrocatalytic hydrogen evolution\, Nature Energy\, 2019\, 4:512-518. https://doi.org/10.1038/s41560-019-0402-6\n\nAchieving Efficient Alkaline Hydrogen Evolution Reaction over a Ni5P4 Catalyst Incorporating Single-Atomic Ru Sites\, Advanced Materials\, 2020\, 32:1906972. https://doi.org/10.1002/adma.201906972\n\nElectrochemical Conversion of CO2 to Syngas with Controllable CO/H2 Ratios over Co and Ni Single-Atom Catalysts\, Angewandte Chemie International Edition\, 2020\, 59:3033-3037. https://doi.org/10.1002/anie.201912719\n\nSingle Nickel Atoms on Nitrogen-Doped Graphene Enabling Enhanced Kinetics of Lithium-Sulfur Batteries\, Advanced Materials\, 2019\, 31:1903955. https://doi.org/10.1002/adma.201903955\n\nStable Metallic 1T-WS2 Nanoribbons Intercalated with Ammonia Ions: The Correlation between Structure and Electrical/Optical Properties\, Advanced Materials\, 2015\, 27:4837-4844. https://doi.org/10.1002/adma.201502134\n\nAtomic Cobalt Covalently Engineered Interlayers for Superior Lithium-Ion Storage\, Advanced Materials\, 2018\, 30:1802 https://doi.org/10.1002/adma.201802525525.\n\nTracking Structural Self-Reconstruction and Identifying True Active Sites toward Cobalt Oxychloride Precatalyst of Oxygen Evolution Reaction\, Advanced Materials\, 2019\, 31:1805127. https://doi.org/10.1002/adma.201805127\n\nAtomic Sn4+ Decorated into Vanadium Carbide MXene Interlayers for Superior Lithium Storage\, Advanced Energy Materials\, 2018\, 9:1802977. https://doi.org/10.1002/aenm.201802977 \n\n\n 
URL:https://xrayabsorption.org/events/journalclub-li-song/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200723
DTEND;VALUE=DATE:20200724
DTSTAMP:20260718T165830
CREATED:20200621T135236Z
LAST-MODIFIED:20200727T030438Z
UID:490-1595462400-1595548799@xrayabsorption.org
SUMMARY:Matthew Marcus: Soft x-ray spectromicroscopy in extraterrestrial materials
DESCRIPTION:Extraterrestrial materials such as meteorites and interplanetary dust particles are often very complex and non-uniform\, with diverse species within a small sample. In some cases\, especially for the products of sample-return missions\, the available samples are small and precious. X-ray micro- and nano-spectroscopy are ideal complements to other methods such as TEM and nano-SIMS. In this talk\, I will review several examples from the literature showing how X-ray spectromicroscopy has been used to study extraterrestrial materials and infer their histories of formation and alteration. I will also review some experimental techniques\, especially STXM. \nReferences: \n\nSandford\, Scott A.\, et al. “Organics captured from comet 81P/Wild 2 by the Stardust spacecraft.” Science 314\, no. 5806 (2006): 1720-1724.\nLo\, Yuan Hung\, et al. “Multimodal x-ray and electron microscopy of the Allende meteorite.” Science advances 5\, no. 9 (2019): eaax3009.\nVan Aken\, P. A.\, and B. Liebscher. “Quantification of ferrous/ferric ratios in minerals: new evaluation schemes of Fe L 23 electron energy-loss near-edge spectra.” Physics and Chemistry of Minerals 29\, no. 3 (2002): 188-200.
URL:https://xrayabsorption.org/events/journalclub-matthew-marcus/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200727
DTEND;VALUE=DATE:20200729
DTSTAMP:20260718T165830
CREATED:20200621T135456Z
LAST-MODIFIED:20200727T030303Z
UID:492-1595808000-1595980799@xrayabsorption.org
SUMMARY:Andy Aquila: The Tender X-ray Imaging (TXI) instrument at the LCLS
DESCRIPTION:This presentation will take place at 6 pm Monday\, Seattle (Los Angeles) time / 9 am Tuesday\, Beijing time using Zoom. For the Zoom link and password\, visit  https://tinyurl.com/XAFStalks  within 30 minutes of the beginning of the presentation. \nThe Linac Coherent Light Source (LCLS) upgrade to a high repetition source offers new avenues to pump/probe X-ray spectroscopies. Here I will briefly introduce the new capabilities of the LCLS focusing on the Tender X-ray Instrument (TXI). The TXI instrument is a dual-beam instrument\, fed by both the soft X-ray and hard X-ray undulators of LCLS; a feature currently unique among XFEL instruments. The tender x-ray instrument will enable x-ray pump/x-ray probe techniques especially in the emerging field of nonlinear x-ray science\, support tender X-ray spectroscopy measurements\, and provide a coherent scattering/ forward diffraction instrument for sub-micron samples. It is designed to accommodate a variety of additional techniques\, such as absorption and photoemission spectroscopy\, as well as an array of samples from fixed targets to gases\, aerosols\, and liquid jet targets. \n\nAbbamonte\, et al.\, New Science Opportunities Enables by LCLS-II X-ray Lasers https://portal.slac.stanford.edu/sites/lcls_public/Documents/LCLS-IIScienceOpportunities_final.pdf\nhttps://lcls.slac.stanford.edu/instruments/neh-1-2
URL:https://xrayabsorption.org/events/journalclub-andy-aquila/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20200730
DTEND;VALUE=DATE:20200731
DTSTAMP:20260718T165830
CREATED:20200621T135910Z
LAST-MODIFIED:20200805T221341Z
UID:494-1596067200-1596153599@xrayabsorption.org
SUMMARY:Thomas Penfold: Towards the Rapid Analysis of XANES for Complex Systems using Deep Neural Networks
DESCRIPTION:X-ray spectroscopy delivers strong impact across the physical and biological sciences by providing end users with highly detailed information about the electronic and geometric structure of matter. To decode this information in challenging cases\, e.g.\, in operando catalysts\, batteries\, and temporally evolving systems [1]\, advanced theoretical calculations are necessary. The complexity and resource requirements often render these out of reach for end users\, and therefore\, the data are often not interpreted exhaustively\, leaving a wealth of valuable information unexploited. In this talk\, I will discuss our recently developed method based upon supervised machine learning of X-ray absorption spectra through the development of a deep neural network (DNN) [2]. This DNN is able to estimate Fe K-edge X-ray absorption near-edge structure spectra in less than a second with no input beyond geometric information about the local environment of the absorption site. We predict peak positions with sub-eV accuracy and peak intensities with errors over an order of magnitude smaller than the spectral variations that the model is engineered to capture. I will also discuss its extension to other absorption edges\, the properties of the network and also highlights areas on which future developments should focus. \nReferences: \n\n C. J. Milne\, T. J. Penfold and M. Chergui Coord. Chem. Rev. 277\, 44-68 (2014).\nC. D. Rankine\, M. M. M. Madkhali\, and T. J. Penfold J. Phys. Chem. A 2020\, 124\, 21\, 4263?4270
URL:https://xrayabsorption.org/events/journalclub-thomas-penfold/
CATEGORIES:XAFS Journal Club
END:VEVENT
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