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X-WR-CALNAME:IXAS: The International X-ray Absorption Society
X-ORIGINAL-URL:https://xrayabsorption.org
X-WR-CALDESC:Events for IXAS: The International X-ray Absorption Society
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DTSTART:20190101T000000
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20200727
DTEND;VALUE=DATE:20200729
DTSTAMP:20260718T191253
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:20260718T191253
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
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