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Title: Approximating the near-edge mass absorption coefficients for Ni using an ultra-thin bimetal foil

In an effort to improve the characteristics of a fluorescing metal-foil-based beam position monitor, a new bimetal ultra-thin (0.98/0.67 µm) Ti–Ni foil was introduced to replace an existing single-element ultra-thin 0.5 µm thick Cr foil. During characterization it was determined that absorption measurements on the bimetal foil could be used to fit the Ni mass absorption coefficients accurately in the vicinity of the NiKedge. Comparison with experimental results from the literature demonstrated that the fitting procedure produced coefficients with uncertainties of the order of ±1%. Once determined, these fit coefficients allowed the thickness of an independently mounted 8 µm thick Ni foil to be computed from absorption measurements instead of relying on a tool-based measurement of the foil thickness. Using the 8 µm thick foil, a continuous map of Ni mass absorption coefficients was produced at 1 eV resolution throughout the near-edge region. Lastly, this high-resolution map marks a significant improvement over the existing NIST XCOM or FFAST database mass absorption coefficients, which have estimated errors of 10–20% for the near-edge region.
Authors:
 [1]
  1. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Crystallography (Online)
Additional Journal Information:
Journal Name: Journal of Applied Crystallography (Online); Journal Volume: 50; Journal Issue: 1; Journal ID: ISSN 1600-5767
Publisher:
International Union of Crystallography
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; mass absorption coefficients; nickel; titanium; absorption; ultra-thin foils; Ni K edge
OSTI Identifier:
1339625

Alkire, Randall W. Approximating the near-edge mass absorption coefficients for Ni using an ultra-thin bimetal foil. United States: N. p., Web. doi:10.1107/S1600576716017544.
Alkire, Randall W. Approximating the near-edge mass absorption coefficients for Ni using an ultra-thin bimetal foil. United States. doi:10.1107/S1600576716017544.
Alkire, Randall W. 2016. "Approximating the near-edge mass absorption coefficients for Ni using an ultra-thin bimetal foil". United States. doi:10.1107/S1600576716017544. https://www.osti.gov/servlets/purl/1339625.
@article{osti_1339625,
title = {Approximating the near-edge mass absorption coefficients for Ni using an ultra-thin bimetal foil},
author = {Alkire, Randall W.},
abstractNote = {In an effort to improve the characteristics of a fluorescing metal-foil-based beam position monitor, a new bimetal ultra-thin (0.98/0.67 µm) Ti–Ni foil was introduced to replace an existing single-element ultra-thin 0.5 µm thick Cr foil. During characterization it was determined that absorption measurements on the bimetal foil could be used to fit the Ni mass absorption coefficients accurately in the vicinity of the NiKedge. Comparison with experimental results from the literature demonstrated that the fitting procedure produced coefficients with uncertainties of the order of ±1%. Once determined, these fit coefficients allowed the thickness of an independently mounted 8 µm thick Ni foil to be computed from absorption measurements instead of relying on a tool-based measurement of the foil thickness. Using the 8 µm thick foil, a continuous map of Ni mass absorption coefficients was produced at 1 eV resolution throughout the near-edge region. Lastly, this high-resolution map marks a significant improvement over the existing NIST XCOM or FFAST database mass absorption coefficients, which have estimated errors of 10–20% for the near-edge region.},
doi = {10.1107/S1600576716017544},
journal = {Journal of Applied Crystallography (Online)},
number = 1,
volume = 50,
place = {United States},
year = {2016},
month = {11}
}