Mössbauer Spectrometer with Magnet

Mössbauer光谱学是原子核状态的一种特定元素光谱学，通过核-电子相互作用也可以获得有关所处理原子的电子状态的信息。这种研究方法已被证明对铁特别有价值和意义，因此在生物无机化学和生物启发配位化学领域，以及对铁化合物研究的许多其他科学领域都具有特别重要的意义。Mössbauer在没有外部磁场的情况下记录的光谱通常显示为吸收铁核的双线谱（2线谱）。由此确定的参数（以及它们对温度的依赖关系）提供了关于铁核的自旋和氧化态或分子动力学在Mössbauer时间尺度上的信息，无论是固体样品还是冷冻溶液。远远超出这个范围的信息可以从Mössbauer在外部施加磁场的情况下记录的光谱中获得。在这里，2线光谱被塞曼效应分成6线光谱，这使得一些非常重要的，更详细的电子和磁性结构信息可见。因此，通过在磁场中Mössbauer光谱可以确定各向异性参数、磁超细耦合、不对称参数和弛豫时间等，从而对所研究的对象提供深入的了解。正是这些见解越来越重要，在某些情况下甚至是必不可少的，在申请人小组的几个研究项目中，涉及仿生配位化学，生物激发催化，铁基分子磁铁和自旋交叉化合物。在德国，配备磁场的Mössbauer光谱仪只在极少数地方可用，到目前为止，Göttingen也没有。通过建立最先进的磁场依赖Mössbauer光谱学仪器，所要求的设备应首先满足申请人群体以及合作伙伴群体的测量需求。为此，所要求的设备将包括一个新型的磁光低温恒温器，它提供了卓越的振动稳定性和高场均匀性，并且还允许在外部物理刺激（如压力或光）的影响下进行温度相关的测量。

Mössbauer spectroscopy is an element-specific spectroscopy of the states of atomic nuclei, whereby nuclear-electron interactions leads to information also about the electronic states of the addressed atoms. This method of investigation has proved to be particularly valuable and meaningful for iron, and it is therefore of particular importance in the fields of bioinorganic chemistry and bioinspired coordination chemistry, but also for many other fields of science in which iron compounds are studied. Mössbauer spectra recorded in the absence of an external magnetic field usually show a doublet (2-line spectrum) for absorbing iron nuclei. The parameters determined from this (as well as their temperature dependence) provide information about, inter alia, spin and oxidation states of the iron nuclei or molecular dynamics on the Mössbauer time scale, both for solid samples and for frozen solutions. Information far beyond this can be gained from Mössbauer spectra recorded in the presence of an externally applied magnetic field. Here, the 2-line spectrum is split by the Zeeman effect into a 6-line spectrum, which makes visible some very important, more detailed information about the electronic and magnetic structure. Thus, by Mössbauer spectroscopy in a magnetic field the anisotropy parameters, magnetic hyperfine couplings, asymmetry parameters and relaxation times, etc., can be determined, providing deep insights into the objects under investigation. It is exactly these insights that are increasingly important, and in some cases even essential, in several research projects of the applicant's group dealing with biomimetic coordination chemistry, bioinspired catalysis, and iron-based molecular magnets and spin-crossover compounds. A Mössbauer spectrometer equipped with a magnetic field is available only in very few locations in Germany, and there is none in Göttingen until now. By establishing state-of-the-art instrumentation for magnetic field-dependent Mössbauer spectroscopy, the requested device should first and foremost cover the measurement needs of the applicant's group as well as cooperating partner groups. To this end, the requested device will comprise a novel magneto-optic cryostat, which offers exceptional vibration stability and high field homogeneity, and which also allows temperature-dependent measurements under the influence of external physical stimuli such as pressure or light.