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Title: Strategies and limitations for fluorescence detection of XAFS at high flux beamlines

Abstract

The issue of detecting the XAFS signal from dilute samples is discussed in detail with the aim of making best use of high flux beamlines that provide up to 10 13 photons -1. Various detection methods are compared, including filters with slits, solid state detectors, crystal analyzers and combinations of these. These comparisons rely on simulations that use experimentally determined parameters. It is found that inelastic scattering places a fundamental limit on detection, and that it is important to take proper account of the polarization dependence of the signals. The combination of a filter–slit system with a solid state detector is a promising approach. With an optimized system good performance can be obtained even if the total count rate is limited to 10 7 Hz. Detection schemes with better energy resolution can help at the largest dilutions if their collection efficiency and count rate limits can be improved.

Authors:
 [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS), X-ray Science Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1261156
Alternate Identifier(s):
OSTI ID: 1396024
Grant/Contract Number:
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Synchrotron Radiation (Online)
Additional Journal Information:
Journal Name: Journal of Synchrotron Radiation (Online); Journal Volume: 22; Journal Issue: 2; Journal ID: ISSN 1600-5775
Publisher:
International Union of Crystallography
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; XAFS detectors; fluorescence; detection strategies; Detector; XAFS

Citation Formats

Heald, Steve M. Strategies and limitations for fluorescence detection of XAFS at high flux beamlines. United States: N. p., 2015. Web. doi:10.1107/s1600577515001320.
Heald, Steve M. Strategies and limitations for fluorescence detection of XAFS at high flux beamlines. United States. doi:10.1107/s1600577515001320.
Heald, Steve M. Tue . "Strategies and limitations for fluorescence detection of XAFS at high flux beamlines". United States. doi:10.1107/s1600577515001320. https://www.osti.gov/servlets/purl/1261156.
@article{osti_1261156,
title = {Strategies and limitations for fluorescence detection of XAFS at high flux beamlines},
author = {Heald, Steve M.},
abstractNote = {The issue of detecting the XAFS signal from dilute samples is discussed in detail with the aim of making best use of high flux beamlines that provide up to 1013 photons-1. Various detection methods are compared, including filters with slits, solid state detectors, crystal analyzers and combinations of these. These comparisons rely on simulations that use experimentally determined parameters. It is found that inelastic scattering places a fundamental limit on detection, and that it is important to take proper account of the polarization dependence of the signals. The combination of a filter–slit system with a solid state detector is a promising approach. With an optimized system good performance can be obtained even if the total count rate is limited to 107 Hz. Detection schemes with better energy resolution can help at the largest dilutions if their collection efficiency and count rate limits can be improved.},
doi = {10.1107/s1600577515001320},
journal = {Journal of Synchrotron Radiation (Online)},
number = 2,
volume = 22,
place = {United States},
year = {Tue Feb 17 00:00:00 EST 2015},
month = {Tue Feb 17 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
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