High-resolution x-ray emission spectrometry and quantification in the Li K spectral range with a reflection zone plate spectrometer

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DFT Simulation of the X-Ray Emission and Absorption Spectra for Different Lithium Compounds

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Calculation of emission spectra of lithium compounds

International audienceAbstract We studied the electronic structure of lithium metal, lithium fluoride, and spodumene using density functional theory. We performed calculations of the total, local and partial density of states, and x‐ray emission spectra. We observed changes in the Li K spectra shape and energy position due to the chemical structure and composition modification. We also outline possible interferences between emission bands

Li K Emissions Detection In Various Compounds Using A Reflection Zone Plate Spectrometer

International audienceSoft x-ray emission spectroscopy (XES) is a technique used to study the electronic structure of materials. It measures the energy spectrum of emitted x-rays from a sample. It is performed by irradiating the sample with ionizing particles (electrons in our case) and measuring the energy distribution of the x-rays that are subsequently emitted. The emitted x-rays are characteristic of the electronic states of the sample, thus, the presence of an element can be detected and could be also used to perform quantitative analysis.Reflection zone plates (RZP) can be used in XES as a wavelength-dispersive element [1]. They consist of a series of concentric zones, each with a slightly different thickness. When x-rays are incident on the zone plate, the different zones act as diffraction gratings, causing the x-rays to diffract and interfere with one another while focusing them at the same time. They have higher spectral resolution and cover wider energy ranges compared to other optical elements such as periodic multilayers. RZPs allow the reach of energy resolutions as low as 0.49 eV at the Al L2,3 line (around 72 eV) [2]. With parallel detection of x-rays in contrast to conventional wavelength dispersive spectroscopy (WDS) spectrometers with a dispersive crystal (or multilayer) based on Rowland mounting they do not have a scanning mechanism. In this work, we demonstrate the use of a Fresnel (RZP) implemented in an electron microprobe for the detection of Li K (around 50-55 eV) emission in different lithium compounds. Li K emission is a characteristic emission band produced when Li 1s levels are ionized inside the material. However, it can be challenging to detect this emission due to its low fluorescence yield, re-absorption effects, and the presence of other spectral lines in the same energy range. We report on our measurements of the Li K emission bands in several lithium compounds with an RZP spectrometer. Our results demonstrate this approach’s potential for various applications in the field of x-ray spectroscopy.Acknowledgment: This research was funded by Agence Nationale de la Recherche in the framework of the SQLX Project (ANR-20-CE29-0022).References[1]A. Erko et al., Opt. Express, vol. 22, no. 14, p. 16897, Jul. 2014, doi: 10.1364/OE.22.016897.[2]A. Hafner et al., Opt. Express, vol. 23, no. 23, p. 29476, Nov. 2015, doi: 10.1364/OE.23.029476

Detection of Li K Emission In Different Lithium Compounds

International audienceSoft x-ray emission spectroscopy (XES) is a technique used to study the electronic structure of materials. It measures the energy spectrum of emitted x-rays from a sample. It is performed by irradiating the sample with ionizing particles (electrons in our case) and measuring the energy distribution of the x-rays that are subsequently emitted. The emitted x-rays are characteristic of the electronic states of the sample, thus, the presence of an element can be detected, and could be also used to perform quantitative analysis.Reflection zone plates (RZP) can be used in XES as a wavelength-dispersive element [1]. They consist of a series of concentric zones, each with a slightly different thickness. When x-rays are incident on the zone plate, the different zones act as diffraction gratings, causing the x-rays to diffract and interfere with one another while focusing them at the same time. They have higher spectral resolution and cover wider energy ranges compared to other optical elements such as periodic multilayers. RZPs allow to the reach of energy resolutions as low as 0.49 eV at the Al L2,3 line (around 72 eV) [2]. With parallel detection of x-rays in contrast to conventional wavelength dispersive spectroscopy (WDS) spectrometers with a dispersive crystal (or multilayer) based on Rowland mounting they do not have a scanning mechanism. In this work, we demonstrate the use of a Fresnel (RZP) implemented in an electron microprobe for the detection of Li K (around 50-55 eV) emission in different lithium compounds. Li K emission is a characteristic emission band produced when Li 1s levels are ionized inside the material. However, it can be challenging to detect this emission due to its low fluorescence yield, re-absorption effects, and the presence of other spectral lines in the same energy range. We report on our measurements of the Li K emission bands in several lithium compounds with an RZP spectrometer. Our results demonstrate this approach’s potential for various applications in the field of x-ray spectroscopy.Acknowledgment: This research was funded by Agence Nationale de la Recherche in the framework of the SQLX Project (ANR-20-CE29-0022).References[1]A. Erko et al., Opt. Express, vol. 22, no. 14, p. 16897, Jul. 2014, doi: 10.1364/OE.22.016897.[2]A. Hafner et al., Opt. Express, vol. 23, no. 23, p. 29476, Nov. 2015, doi: 10.1364/OE.23.029476

Reflection Zone Plate Spectrometer For Li K Emission Detection In Lithium Compounds

International audienceSoft X-ray emission spectroscopy (XES) is a technique employed to investigate the electronic structure of materials by analyzing the energy spectrum of x-rays emitted from a sample. The technique involves exposing the sample to ionizing particles, such as electrons, and then measuring the energy distribution of the emitted x-rays. By detecting these characteristic x-rays, we can determine the presence of specific elements and be used for quantitative analysis.One type of optical dispersive element that can be used in XES is a reflection zone plate (RZP) [1], which is composed of concentric zones of varying thicknesses. RZPs act as diffraction gratings when x-rays are incident upon them, resulting in diffraction and interference of the x-rays, while simultaneously focusing them. Compared to other optical elements like periodic multilayers, RZPs offer higher spectral resolution and can cover wider energy ranges, and can achieve energy resolutions as low as 0.49 eV at the Al L2,3 line (around 72 eV) [2].In this study, we employed a Fresnel RZP in an electron microprobe to detect Li K emission in different lithium compounds. Li K emission is a characteristic emission produced when Li 1s levels are ionized in the material. However, detecting this emission can be challenging due to its low fluorescence yield, re-absorption effects, and interference from other spectral lines in the same energy range. We reported the measurement of the Li K emission bands in several lithium compounds using an RZP spectrometer, demonstrating the potential of this approach for various applications in x-ray spectroscopy.Acknowledgment: This research was funded by Agence Nationale de la Recherche in the framework of the SQLX Project (ANR-20-CE29-0022).References[1]A. Erko et al., Opt. Express, vol. 22, no. 14, p. 16897, Jul. 2014, doi: 10.1364/OE.22.016897.[2]A. Hafner et al., Opt. Express, vol. 23, no. 23, p. 29476, Nov. 2015, doi: 10.1364/OE.23.029476