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Title: Absolute x-ray energy calibration and monitoring using a diffraction-based method

Abstract

In this paper, we report some recent developments of the diffraction-based absolute X-ray energy calibration method. In this calibration method, high spatial resolution of the measured detector offset is essential. To this end, a remotely controlled long-translation motorized stage was employed instead of the less convenient gauge blocks. It is found that the precision of absolute X-ray energy calibration (ΔE/E) is readily achieved down to the level of 10{sup −4} for high-energy monochromatic X-rays (e.g. 80 keV). Examples of applications to pair distribution function (PDF) measurements and energy monitoring for high-energy X-rays are presented.

Authors:
;  [1];  [2];  [1];  [3]
  1. Mineral Physics Institute, Stony Brook University, Stony Brook, NY 11794 (United States)
  2. Department of Geosciences, Princeton University, Princeton, NJ 08544 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22608438
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1741; Journal Issue: 1; Conference: SRI2015: 12. international conference on synchrotron radiation instrumentation, New York, NY (United States), 6-10 Jul 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CALIBRATION; DIFFRACTION; DISTRIBUTION; DISTRIBUTION FUNCTIONS; MONOCHROMATIC RADIATION; SPATIAL RESOLUTION; X RADIATION

Citation Formats

Hong, Xinguo, E-mail: xhong@bnl.gov, Weidner, Donald J., Duffy, Thomas S., Ehm, Lars, and National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973. Absolute x-ray energy calibration and monitoring using a diffraction-based method. United States: N. p., 2016. Web. doi:10.1063/1.4952932.
Hong, Xinguo, E-mail: xhong@bnl.gov, Weidner, Donald J., Duffy, Thomas S., Ehm, Lars, & National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973. Absolute x-ray energy calibration and monitoring using a diffraction-based method. United States. doi:10.1063/1.4952932.
Hong, Xinguo, E-mail: xhong@bnl.gov, Weidner, Donald J., Duffy, Thomas S., Ehm, Lars, and National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973. 2016. "Absolute x-ray energy calibration and monitoring using a diffraction-based method". United States. doi:10.1063/1.4952932.
@article{osti_22608438,
title = {Absolute x-ray energy calibration and monitoring using a diffraction-based method},
author = {Hong, Xinguo, E-mail: xhong@bnl.gov and Weidner, Donald J. and Duffy, Thomas S. and Ehm, Lars and National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973},
abstractNote = {In this paper, we report some recent developments of the diffraction-based absolute X-ray energy calibration method. In this calibration method, high spatial resolution of the measured detector offset is essential. To this end, a remotely controlled long-translation motorized stage was employed instead of the less convenient gauge blocks. It is found that the precision of absolute X-ray energy calibration (ΔE/E) is readily achieved down to the level of 10{sup −4} for high-energy monochromatic X-rays (e.g. 80 keV). Examples of applications to pair distribution function (PDF) measurements and energy monitoring for high-energy X-rays are presented.},
doi = {10.1063/1.4952932},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1741,
place = {United States},
year = 2016,
month = 7
}
  • In this paper, we report a method of precise and fast absolute x-ray energy calibration over a wide energy range using an iterative x-ray diffraction based method. Although accurate x-ray energy calibration is indispensable for x-ray energy-sensitive scattering and diffraction experiments, there is still a lack of effective methods to precisely calibrate energy over a wide range, especially when normal transmission monitoring is not an option and complicated micro-focusing optics are fixed in place. It is found that by using an iterative algorithm the x-ray energy is only tied to the relative offset of sample-to-detector distance, which can be readilymore » varied with high precision of the order of 10{sup -5}-10{sup -6} spatial resolution using gauge blocks. Even starting with arbitrary initial values of 0.1 A, 0.3 A, and 0.4 A, the iteration process converges to a value within 3.5 eV for 31.122 keV x-rays after three iterations. Different common diffraction standards CeO{sub 2}, Au, and Si show an energy deviation of 14 eV. As an application, the proposed method has been applied to determine the energy-sensitive first sharp diffraction peak of network forming GeO{sub 2} glass at high pressure, exhibiting a distinct behavior in the pressure range of 2-4 GPa. Another application presented is pair distribution function measurement using calibrated high-energy x-rays at 82.273 keV. Unlike the traditional x-ray absorption-based calibration method, the proposed approach does not rely on any edges of specific elements, and is applicable to the hard x-ray region where no appropriate absorption edge is available.« less
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