Mössbauer Spectrometer with Magnet

带磁铁的穆斯堡尔光谱仪

• 批准号: 424956795
• 金额: --
• 依托单位: Georg-August-Universität Göttingen
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/424956795?language=en
• 关键词: ssbauer; Spectrometer; Magnet

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.

穆斯堡尔谱是原子核状态的元素特定光谱学，其中核-电子相互作用也导致关于所寻址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，因此它在生物无机化学和生物启发配位化学领域特别重要，而且对于研究铁化合物的许多其他科学领域也特别重要。在没有外部磁场的情况下记录的穆斯堡尔谱通常显示吸收铁核的双重谱线（2线谱）。由此确定的参数（以及它们的温度依赖性）提供了关于铁核的自旋和氧化态或穆斯堡尔时间尺度上的分子动力学的信息，无论是固体样品还是冷冻溶液。信息远远超出这可以从穆斯堡尔谱记录在一个外加磁场的存在。在这里，2线光谱被塞曼效应分裂成6线光谱，这使得一些非常重要的，关于电子和磁性结构的更详细的信息变得可见。因此，通过磁场中的穆斯堡尔谱，可以得到各向异性参数、磁超精细耦合、不对称参数和弛豫时间等，可以被确定，提供深入了解被调查的对象。正是这些见解在申请人小组的几个研究项目中越来越重要，在某些情况下甚至是必不可少的，这些研究项目涉及仿生配位化学，生物启发催化，铁基分子磁体和自旋交叉化合物。在德国，只有极少数地方有配备磁场的穆斯堡尔谱仪，直到现在哥廷根还没有。通过建立最先进的磁场相关穆斯堡尔光谱仪器，所要求的设备应首先满足申请人团体以及合作伙伴团体的测量需求。为此，所要求的设备将包括一种新型的磁光低温恒温器，其提供优异的振动稳定性和高场均匀性，并且还允许在诸如压力或光的外部物理刺激的影响下进行温度相关的测量。