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DTSTART;TZID=America/Los_Angeles:20200423T090000
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DTSTAMP:20260718T151753
CREATED:20200512T033410Z
LAST-MODIFIED:20200512T035931Z
UID:327-1587632400-1587636000@xrayabsorption.org
SUMMARY:Joe Fowler: X-ray Fluorescence Line Metrology for the 21st Century
DESCRIPTION:Databases of x-ray fluorescence line energies such as those of Deslattes (2003) and Bearden (1967) are critical to the calibration of any analytical tools that identify elemental compositions by their x-ray “fingerprints.” To be useful\, such tables have to favor completeness over accuracy. Unfortunately\, a full 75% of the lines in the current NIST database (SRD-128) rely on measurements at least 50 years old\, coming from an age when the SI meter and the x-ray wavelength had never been tied together. Worse\, SRD-128 lacks all information about line shapes or any M lines whatsoever. At NIST\, we have begun a program to measure as many lines as possible with transition-edge sensor (TES) microcalorimeters\, starting with the hard x-ray L lines of certain lanthanide metals. As Kelsey Morgan described on March 30\, a TES combines advantages of solid-state detectors and diffractometers: it measures an enormous spectral region at once with resolving power of 1000 or higher. In tandem\, we have also rejuvenated the SI-traceable diffractometer of Deslattes’ team\, in order to expand the limited set of lines available for calibration of the TES spectrometer. \nhttps://arxiv.org/abs/1702.00507 and https://arxiv.org/abs/1511.03950
URL:https://xrayabsorption.org/events/journalclub-joe-fowler/
CATEGORIES:XAFS Journal Club
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