Title: A new μ-high energy resolution fluorescence detection microprobe imaging spectrometer at the Stanford Synchrotron Radiation Lightsource beamline 6-2

Abstract

In this report we describe a new synchrotron X-ray Fluorescence (XRF) imaging instrument with an integrated High Energy Fluorescence Detection X-ray Absorption Spectroscopy (HERFD-XAS) spectrometer at the Stanford Synchrotron Radiation Lightsource at beamline 6-2. The X-ray beam size on the sample can be defined via a range of pinhole apertures or focusing optics. XRF imaging is performed using a continuous rapid scan system with sample stages covering a travel range of 250 × 200 mm², allowing for multiple samples and/or large samples to be mounted. The HERFD spectrometer is a Johann-type with seven spherically bent 100 mm diameter crystals arranged on intersecting Rowland circles of 1 m diameter with a total solid angle of about 0.44% of 4π sr. A wide range of emission lines can be studied with the available Bragg angle range of ~64.5°–82.6°. With this instrument, elements in a sample can be rapidly mapped via XRF and then selected features targeted for HERFD-XAS analysis. Furthermore, utilizing the higher spectral resolution of HERFD for XRF imaging provides better separation of interfering emission lines, and it can be used to select a much narrower emission bandwidth, resulting in increased image contrast for imaging specific element species, i.e., sparse excitation energy XAS imaging.more » This combination of features and characteristics provides a highly adaptable and valuable tool in the study of a wide range of materials.« less

Authors:

Edwards, Nicholas P.  ^[1];

• Search DOE PAGES for author "Edwards, Nicholas P."
• Search DOE PAGES for ORCID "0000-0002-3760-4225"

Bargar, John R. ^[1]; van Campen, Douglas ^[1]; van Veelen, Arjen  ^[2];

• Search DOE PAGES for author "van Veelen, Arjen"
• Search DOE PAGES for ORCID "0000-0002-8176-3645"

Sokaras, Dimosthenis  ^[1];

• Search DOE PAGES for author "Sokaras, Dimosthenis"
• Search DOE PAGES for ORCID "0000-0001-8117-1933"

Bergmann, Uwe ^[3]; Webb, Samuel M.  ^[1]

• Search DOE PAGES for author "Webb, Samuel M."
• Search DOE PAGES for ORCID "0000-0003-1188-0464"

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+ Show Author Affiliations

1. SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
2. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
3. University of Wisconsin, Madison, WI (United States)

Publication Date:

Fri Aug 19 00:00:00 EDT 2022

Research Org.:

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Contributing Org.:

SSRL

OSTI Identifier:

1908435

Alternate Identifier(s):

OSTI ID: 1882789

Grant/Contract Number:  

AC02-76SF00515; P30GM133894; 89233218CNA000001

Resource Type:

Accepted Manuscript

Journal Name:

Review of Scientific Instruments

Additional Journal Information:

Journal Volume: 93; Journal Issue: 8; Journal ID: ISSN 0034-6748

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

47 OTHER INSTRUMENTATION