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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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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200406T090000
DTEND;TZID=America/Los_Angeles:20200406T100000
DTSTAMP:20260727T085406
CREATED:20200512T034629Z
LAST-MODIFIED:20200512T035932Z
UID:339-1586163600-1586167200@xrayabsorption.org
SUMMARY:Steve Heald: Sector 25 at the APS-U: Two new beamlines for advanced spectroscopy
DESCRIPTION:As part of the Advanced Photon Source (APS) Multibend Achromat lattice upgrade two new beamlines for spectroscopy will be constructed on a canted undulator source at Sector 25. The programs at the 20-ID beamline at the APS need to move to sector 25 to make room for a planned long beamline. These will be combined with some other APS spectroscopy programs at sector 25 to use two new beamlines on a canted undulator. These two beamlines will service existing and upgraded endstations covering a variety of spectroscopy applications. There will be a microprobe branch that will provide sub-micron beams for fluorescence imaging\, and micro-XAFS. These can be combined with confocal optics for micron level depth sensitivity. This branch will also have a station for XAFS experiments requiring a high-brilliance high-flux beam such as doped thin films or ultra-dilute samples. The second Advanced Spectroscopy branch will provide beam to two inline hutches. The first will have stations for both an enhanced LERIX spectrometer for non-resonant inelastic scattering (x-ray Raman)\, and spectrometers for high resolution emission spectroscopy. The second hutch will provide space for experiments requiring extensive setup\, such as time-resolved pump-probe experiments. Both hutches will have a variety of focusing options providing beam sizes down to a few microns. To provide greater beam separation\, both lines will have side deflecting mirrors for harmonic rejection\, and focusing/collimation. The planned energy ranges are 4-32 keV for the microprobe branch\, and 4-40 keV for the Advanced Spectroscopy branch. The horizontal deflection mirrors allow use of small offset monochromators equipped with liquid nitrogen cooled Si (111) crystals for monochromatic beam\, and wide-bandpass multilayers providing higher flux for experiments that do not need high resolution such as imaging and non-resonant emission spectroscopy. The Advanced Spectroscopy branch will also have a secondary monochromator for experiments needing better resolution than provided by Si (111).
URL:https://xrayabsorption.org/events/journalclub-steve-heald/
CATEGORIES:XAFS Journal Club
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200402T090000
DTEND;TZID=America/Los_Angeles:20200402T100000
DTSTAMP:20260727T085406
CREATED:20200512T034838Z
LAST-MODIFIED:20200512T035932Z
UID:341-1585818000-1585821600@xrayabsorption.org
SUMMARY:Martin McBriarty: Top-Down Approaches to EXAFS Analysis
DESCRIPTION:EXAFS spectra are often modeled using a small number of virtual coordination shells which can vary in coordination number\, bond length\, and disorder. While this bottom-up approach is generally successful for single-phase samples\, it becomes intractable when the element of interest occupies multiple complex coordination states. Such cases may require a top-down approach\, in which the measured spectrum is fitted using models with fixed atom positions and disorder. Given reasonable starting assumptions\, such as ab initio molecular dynamics (AIMD) simulations of each possible component of the sample\, the actual coordination states can be identified and quantified. I will present two examples of top-down solutions to difficult EXAFS problems: (1) the mechanisms of uranium incorporation into iron (oxyhydr)oxide minerals\, and (2) the distribution of crystal phases in ferroelectric HfO2/ZrO2 nanostructures \nhttps://onlinelibrary.wiley.com/doi/full/10.1002/pssb.201900285 https://pubs.acs.org/doi/abs/10.1021/acs.est.8b00297
URL:https://xrayabsorption.org/events/journalclub-martin-mcbriarty/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200330T090000
DTEND;TZID=America/Los_Angeles:20200330T100000
DTSTAMP:20260727T085406
CREATED:20200512T035015Z
LAST-MODIFIED:20200512T035932Z
UID:343-1585558800-1585562400@xrayabsorption.org
SUMMARY:Kelsey Morgan: Hot science with cool sensors
DESCRIPTION:The transition-edge sensor (TES) microcalorimeter uses the sharply temperature-dependent resistance of the superconducting transition to measure the energy of X-ray and gamma ray photons. A single TES is a broadband\, energy-dispersive area detector capable of eV-scale energy resolution with good quantum efficiency. With an array of hundreds or thousands of sensors\, a TES-based spectrometer can have orders of magnitude higher throughput than wavelength dispersive instruments. In this talk\, I will introduce the basic principles of TES operation\, and discuss how they are exploited to design sensors with resolving power R > 1000 at a wide range of photon energies\, from soft X-rays to gamma rays. This capability makes the TES a powerful tool for PFY-XAFS\, RIXS\, and time-resolved XES/XAS measurements\, particularly for weak sources or for highly dilute or radiation-sensitive samples. I will provide a brief overview of the TES spectrometers that are currently available to the X-ray science community\, and then highlight some exciting new instruments that are currently under development. \nhttps://physicstoday.scitation.org/doi/full/10.1063/PT.3.3995
URL:https://xrayabsorption.org/events/journalclub-kelsey-morgan/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200326T090000
DTEND;TZID=America/Los_Angeles:20200326T100000
DTSTAMP:20260727T085406
CREATED:20200512T035155Z
LAST-MODIFIED:20200512T035932Z
UID:345-1585213200-1585216800@xrayabsorption.org
SUMMARY:Adam Hitchcock: Soft X-ray Spectromicroscopy in Scanning Transmission X-ray Microscopes
DESCRIPTION:Soft X-ray scanning transmission microscopy (STXM) is a powerful tool for nanoscale materials analysis\, with significant advantages over analytical electron microscopies for studies of radiation sensitive materials. Chemical species identified by near edge X-ray absorption fine structure (NEXAFS) spectra can be mapped quantitatively in 2D and in 3D. STXM instrumentation and methods will be described\, with emphasis on spectromicroscopy: chemical mapping by the analysis of images measured at many photon energies. Performance will be illustrated by recent studies of (i) cathodes of low temperature\, proton exchange membrane fuel cells (PEM-FC)\, which are under development for automotive applications\, and (ii) biomineralization of single domain\, single crystal nano-magnetite by magnetotactic bacteria. \nReferences: https://doi.org/10.1016/j.elspec.2015.05.013 and https://doi.org/10.1016/j.jpowsour.2018.01.074 and https://doi.org/10.1016/j.chemgeo.2019.119348
URL:https://xrayabsorption.org/events/journalclub-adam-hitchcock/
CATEGORIES:XAFS Journal Club
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BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200323T090000
DTEND;TZID=America/Los_Angeles:20200323T100000
DTSTAMP:20260727T085406
CREATED:20200512T035351Z
LAST-MODIFIED:20200512T035932Z
UID:347-1584954000-1584957600@xrayabsorption.org
SUMMARY:Evan Jahrman	Core-to-core X-ray Emission Spectroscopy: Pitfalls and Advantages for Lab-based and Synchrotron Users
DESCRIPTION:Core-to-core X-ray emission spectroscopy (CTC-XES) has not only provided key insights into atomic physics but is extremely well positioned to serve as a major analytical technique for several materials systems in the coming decades. Moreover\, CTC-XES frequently serves as an enabling phenomenon for more exotic varieties of synchrotron-based XAFS. I will cover several applications of CTC-XES and explain the origin and shape of commonly observed spectral features. I intend to make this talk both a pleasant refresher for seasoned X-ray physicists and useful to graduate students preparing to embark on their own materials characterization campaigns. \nReferences: https://doi.org/10.1103/PhysRevB.50.11347 and\nhttps://doi.org/10.1021/acs.analchem.8b00302
URL:https://xrayabsorption.org/events/journalclub-evan-jahrman/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200319T090000
DTEND;TZID=America/Los_Angeles:20200319T100000
DTSTAMP:20260727T085406
CREATED:20200512T035516Z
LAST-MODIFIED:20200512T035557Z
UID:349-1584608400-1584612000@xrayabsorption.org
SUMMARY:Simo Huotari:	X-ray Raman spectroscopy: glimpse of the state of the art for samples in complex environments
DESCRIPTION:In this lecture I will continue where the previous lecture ends and talk about some examples of how XRS is used to study materials under high pressure and chemical reactions. \nReferences: https://www.nature.com/articles/nmat3031 and https://pubs.acs.org/doi/abs/10.1021/jp912208v
URL:https://xrayabsorption.org/events/journalclub-simo-huotari/
CATEGORIES:XAFS Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/Los_Angeles:20200318T090000
DTEND;TZID=America/Los_Angeles:20200318T100000
DTSTAMP:20260727T085406
CREATED:20200512T035717Z
LAST-MODIFIED:20200512T035717Z
UID:351-1584522000-1584525600@xrayabsorption.org
SUMMARY:Jerry Seidler: What is X-ray Raman Scattering\, and What Did Raman Have to Do With It?
DESCRIPTION:X-ray Raman Scattering (XRS\, often also called nonresonant inelastic x-ray scattering)\, is a hard x-ray alternative to soft x-ray NEXAFS. I’ll review the basic physics\, including the role of momentum transfer to tune selection rules. And I’ll explain Raman’s involvement\, or lack thereof. \nReferences:\nhttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.74.214117  and https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.105.053202
URL:https://xrayabsorption.org/events/journalclub-jerry-seidler_mar2020/
CATEGORIES:XAFS Journal Club
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