hiXAS
integrated XAS solution
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lab-based turn-key EXAFS and XANES system
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synchrotron-quality spectra
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very high signal to noise ratio
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wide bandpass of up to 1keV
hiXAS offers a complete lab-based solution for Extended X-ray Absorption Fine Structure (EXAFS) and X-ray Absorption Near Edge Structure (XANES) measurements. In a compact footprint, it integrates x-ray tube source, high-resolution spectrometer, and hybrid detector together with a software suite to control instrument functions and analyze data.
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Spectra quality is on par with synchrotron measurements, so that tedious applying and waiting for beamtime is no longer necessary.
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The x-ray tube source and spectrometer cover the energy range 4 to 30 keV, thus including the K absorption edges of
3d-transition metals. The optimized HAPG von Hamos architecture of the spectrometer yields an extremely high signal-to-noise ratio. As a consequence, the analyte concentration can be as low as a few weight percent. The instrument combines high efficiency with high spectral resolving power of up to E/ΔE = 4000, constant over the range of the covered absorption edges.
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Customized versions of hiXAS are available. For applications at lower energies, see proXAS. Please contact us to discuss your application.
Elemental range
Range of elements accessible to hiXAS for EXAFS and XANES measurements. Even diluted samples with analyte concentrations of only a few weight percent can be measured in a time frame of several minutes.
Downloads
hiXAS: turn-key laboratory XAS solution
specifications
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Optimizing catalysts for synthesis gas conversion with lab-based XANES
white paper
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Advancing electrolysis catalysts with lab-based XANES
white paper
Results
Absorption spectra of the Fe K-edge measured by hiXAS during the charge/discharge process of a potassium-ion battery with iron-based sulfate cathode. A reversible Fe3+/Fe2+ redox transition is observed, consistent with the results of XPS analysis. The FT-EXAFS analysis shows an Fe-O bond length change during charge/discharge due to Fe oxidation.
X. Xu et al, A new iron-based sulfate cathode material for high-performance potassium-ion battery
XAFS analysis with hiXAS of the coordination environment and valence states in an alloy aerogel. The measured aerogel CuCoNiPtRu allows for electrocatalytic nitrate reduction to ammonia, as a carbon-neutral alternative to the Haber-Bosch process. The shifted Ni K- and Pt L3-edges indicate charge transfer from Ni to Pt, consistent with XPS results.
S. Li et al, A Reaction-Diffusion-Coupled Strategy for Ampere -Level Electrocatalytic Nitrate Reduction to Ammonia
Structural analysis of m-ZnHHTP. The Zn K-edge XANES spectra from hiXAS exhibit near-edge absorption consistent with a Zn2+ oxidation state. The two signal peaks in the FT-EXAFS for m-ZnHHTP correspond to the Zn-O and Zn-Zn bond scattering paths, respectively.
J. Chen et al, Tandem Assembly and Etching Chemistry towards Mesoporous Conductive Metal-Organic Frameworks for Sodium Storage over 50,000 Cycles
Characterization of the valence states of UClx. The sample was stainless steel 316 corroded in high temperature NaCl-KCl-UClx salts to investigate the effect of uranium-containing salts. The XANES spectrum of hiXAS shows the LIII edge of uranium at 17170.3 eV. Reference comparisons imply that the sample contains trivalent and tetravalent states of U with 60 % and 40 %, respectively.
J. W. Park et al, Formation of UO2 on stainless steel 316 corroded in NaCl-KCl-UClx (x = 3,4) salts
XANES and EXAFS measurements of a Cu foil
Acquisition time: 3 min. For comparison, measurement (black curves) performed at beamline 13-ID-E22 at the Advanced Photon Source synchrotron with a spectral resolving power of 8000.
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C. Schlesiger et al, Recent progress in the performance of HAPG based laboratory EXAFS and XANES spectrometers
X-ray absorption spectrum of a 25um-thick Zr foil. Comparison to the spectrum obtained at the Photon Factory BL9 beamline shows the high-energy capabilities of hiXAS.
Acquisition time of 3h.
Applications
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Chemical speciation and concentration ratios
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Compound research
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Short range order and bond length determination
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Catalyst analysis