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Sigray QuantumLeap-H2000 X-Ray Absorption Spectroscopy (XAS) System
First laboratory XAS system with both transmission and fluorescence mode XAS
The first commercial laboratory-based Hybrid XAS System offering both transmission and fluorescence XAS modes, in scanning geometry. System is in ambient conditions with the line focus spots reaching 50um in short dimension and 1-2mm in the long dimension.
Specialised for achieving synchrotron-grade XAS, in both transmission and fluorescence modes, in ambient-based laboratory conditions to provide chemical state and electronic structure information
Synchrotron-like Performance in a Laboratory XAS System
Compared to conventional high Bragg angle laboratory XAS systems, the Quantumleap H2000 has significant advantages including:
- Optimised throughput of 5X flux for XANES and 20X flux for EXAFS
- Only 4 crystal analysers are needed to cover the complete energy range of 4 to 20 keV (whereas multiple crystals may be required for a single 1 keV XAS spectrum in high Bragg angle systems). The small number enables the system to include all crystals on a software selectable robotic stage.
- Constant spot profile unlike for high Bragg angle XAS systems, the spot size changes significantly for every crystal rotation which places restrictions on sample uniformity.
- Flux for operation in fluorescence-mode
Conventional laboratory XAS systems [left] use large spot sized, high powered x-ray sources, a Johann spherically bent crystal analyser (SBCA), and a silicon drift detector; such designs operate at high Bragg angles on a large Rowland circle. Sigray’s QuantumLeap-H2000 uses a high powered x-ray source that has a small dimension along the tangential direction and large dimension in the sagittal direction (which in this illustration, is into the paper). The source, along a Johansson crystal and a novel pixelated energy thresholding detector, enables advantageous operation at low Bragg angles.
XAS GALLERY LINKS:
FEATURES
Specialised for achieving synchrotron-grade XAS, in both transmission and fluorescence modes, in ambient-based laboratory conditions to provide chemical state and electronic structure information
- Patented design enabling acquisition at low Bragg angles (e.g. 15 to 30 degrees) through use of a Johansson crystal in combination with a photon counting detector. Therefore, stitching data is not needed (which results in artifacts and slower data acquisition).
- Patented X-ray source with outstanding brightness and a multi-target design for ideal spectral output
- Patented acquisition approach to optimize XAS spectra at highest throughput, achieving down to 0.5eV energy resolution
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Comparison
SPECIFICATION
| Parameter | Specification | |
|---|---|---|
| Overall | Energy Coverage | 4.5 to 25 keV |
| XAS Acquisition | Transmission mode Fluorescence mode |
|
| Energy Resolution | Sub-eV in XANES 5-10 eV in EXAFS (Note that you can also use XANES mode to acquire high resolution EXAFS) |
|
| Beam Path | Helium flight path | |
| Focus at Sample | Line focus: 30-100 μm in one direction; ~300 um – 3mm in other direction | |
| Source | Type | Sigray patented ultrahigh brightness sealed microfocus source |
| Target(s) | W and Mo standard. Others available upon request. |
|
| Power | Voltage | 300W | 20-50 kVp | |
| X-ray Crystals | Type | 2 Johansson single crystals 1 mosaic crystal |
| X-ray Detector(s) | Type(s) | Spatially resolving (pixelated detector) for transmission XAS Silicon drift detector (SDD) for fluorescence XAS |
| Count Rate | 10^8 x-rays/s for photon counting detector 500k cps for SDD |
|
| Dimensions | Footprint | 53″ W x 77″ H x 66″ D |
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Results and Applications
Catalysts
Catalysts, which are used to speed up chemical reactions, are estimated to be used in 90% of all commercially produced chemical products and represent more than a $30B global market. They are used in a vast array of applications, spanning from polymers, food science, petroleum, energy processing, and fine chemicals. Synchrotron-based XAS has become the method of choice for developing novel catalysts and to link structural motifs with catalytic properties. QuantumLeap provides convenient in-laboratory access to such capabilities without requiring the time and expense of acquiring synchrotron beamtime. Graph: Analysis of chemistry in a Co-Cu catalyst sample and measurement of a reference Co foil. Note high resolution features such as pre-edges can be clearly seen.
Batteries and Fuel Cells
There are a very large number of potential electrode hosts for Li+ being explored in lithium ion batteries (LIBs), including different material compositions and various structures (micro to nanosized). XAS is commonly used to characterise structural and electronic information of electrodes to obtain understanding of electrochemical mechanisms governing a given battery’s chemistry. Sigray’s QuantumLeap not only enables ex-situ determination of electrocatalyst chemistry, but is also designed with baffles and feedthroughs for optional in-situ cells to study changes in-operando. Furthermore, the vacuum enclosure of the QuantumLeap-V210 permits analysis of important new battery concepts such as high energy density Li-S batteries by providing access to sulphur chemistry. Graph: XANES spectrum of a new versus aged lithium ion battery cathode, demonstrating chemical changes
Nanoparticles and Nanotubes
The electric, magnetic, and catalytic properties of nanoparticles differ strongly from the same materials in bulk phase. These properties depend on the nanoparticle’s size and shape. Nanoparticles of 1-5nm in size are difficult to characterize with ordinary laboratory techniques such as XRD and TEM. XAS provides information on the distance of atoms, average size of particles smaller than 2nm, and even shape. Graph: Hematite and magnetite iron nanopowder XANES analysis
