X-ray absorption spectrometer

X射线吸收光谱（XAS）已成为表征含金属固态化合物结构和性质的重要方法之一。它被广泛应用于从固态科学和磁性到催化和储能的领域。通常情况下，大多数XAS研究都是在同步加速器上进行的，在同步加速器上可以获得高X射线光子通量和可调X射线波长以及定制的X射线光学器件和探测器。在过去的十年中，由于高光子通量微焦点X射线管的出现，第一个基于实验室的XAS系统已经可用。在美因茨约翰内斯古滕贝格大学（JGU），化学系和物理研究所的一系列小组是基于同步加速器的XAS的常规用户，用于研究催化，电催化，光（电）催化，表面科学和磁性材料。然而，由于行政延误和竞争的性质，获得同步加速器束时间，定期和及时访问XAS是不平凡的。这在长期/长期系列实验或方法开发时尤其成问题，例如，为在原位/operando XAS光谱电化学的目标。为了在JGU的美因茨校园现场进行此类研究，该提案旨在为美因茨的第一个基于实验室的XAS系统吸引资金，并据我们所知，在整个莱茵兰-普法尔茨和莱茵-美因大学（RMU，即JGU，TU达姆施塔特，歌德大学法兰克福）地区。根据实验组的要求，该提案旨在安装一个高性能的实验室XAS系统，该系统配备两个X射线源，用于自动采样的自动样品交换系统和单独优化的X射线光学器件，用于收集高质量的XANES（X射线吸收近边结构）和EXAFS（扩展X射线吸收精细结构）数据。基于JGU当前和计划的研究，以及可持续性，催化和材料领域的战略发展，我们预计该系统将为美因茨的化学，物理，材料科学和地质科学以及更广泛的莱茵兰-普法尔茨和莱茵-美因学术环境做出重要的战略长期贡献。

X-ray absorption spectroscopy (XAS) has become one of the most important methods for characterizing structures and properties of metal-containing solid-state compounds. It is widely used in areas ranging from solid-state science and magnetism to catalysis and energy storage. Typically, most XAS studies are carried out at synchrotrons, where high X-ray photon fluxes and tunable X-ray wavelengths together with custom-built X-ray optics and detectors are available. Over the last decade, due to the advent of high photon-flux microfocus X-ray tubes, the first lab-based XAS systems have become available. At Johannes Gutenberg University Mainz (JGU), a range of groups in the department of chemistry and the institute of physics are regular users of synchrotron based XAS to study materials for catalysis, electrocatalysis, photo(electro)catalysis, surface science and magnetism. However, due to the administrative delays and the competitive nature of getting synchrotron beamtime, regular and timely access to XAS is not trivial. This is particularly problematic when long/term series of experiments or method development, e.g., for in situ/operando XAS spectro-electrochemistry are targeted. To enable these kinds of studies on site at the Mainz campus of JGU, this proposal aims to attract funding for the first lab-based XAS system in Mainz, and – to the best of our knowledge – in the whole of Rheinland-Pfalz and the Rhein-Main-Universities (RMU, i.e. JGU, TU Darmstadt, Goethe-University Frankfurt) region. Based on the requirements of the experimental groups, this proposal aims for the installation of a high-performance lab XAS system equipped with two X-ray sources, automatic sample exchange system for auto-sampling and individual optimized X-ray optics for collecting high-quality XANES (X-ray absorption near-edge structure) and EXAFS (extended X-ray absorption fine-structure) data. Based on the current and planned research at JGU, as well as the strategic developments in the areas sustainability, catalysis, and materials, we expect that the system will make an important strategic long-term contribution to chemistry, physics, material science and geo sciences in Mainz and the wider Rheinland-Pfalz and Rhein-Main academic environment.