Hyperspectral μ-XANES mapping in the diamond-anvil cell: analytical procedure applied to the decomposition of (Mg,Fe)-ringwoodite at the upper/lower mantle boundary
Hyperspectral μ-XANES mapping in the diamond-anvil cell: analytical procedure applied to the decomposition of (Mg,Fe)-ringwoodite at the upper/lower mantle boundary
复制标题
金刚石砧室中的高光谱 Î⁄-XANES 测绘：应用于上/下地幔边界处 (Mg,Fe)-尖角橄榄石分解的分析程序
DOI：
10.1080/08957950802517625
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发表时间：
2008
影响因子：
2
通讯作者：
L. Dubrovinsky
中科院分区：
文献类型：
--
作者：
M. Muñoz;S. Pascarelli;G. Aquilanti;O. Narygina;L. Dubrovinsky
我们提出了一种新的解析方法来从基于μ-X射线吸收光谱(XAS)的映射技术中提取信息，其中地图的每个像素都包含完整的XANE(X射线近边吸收结构)信息。数据减少要归功于专门开发的软件XASMAP，该软件允许自动归一化、线性组合拟合、地图重建和光谱提取。我们给出了一个应用于激光加热的金刚石砧腔数据的例子，该数据致力于研究在与地球上/下地幔边界有关的条件下，(Mg，Fe)环状木石分解为钙钛矿和铁方镁石的过程中铁的行为。对1600Fe K边XANES谱的分析可以重建基于铁形态的图谱，但它也可以驱动三个晶相的复杂混合物中的铁浓度图谱。这一分析程序为地球科学、物理和化学界在极端压力和温度条件下进行情景研究开辟了道路。
We propose a new analytical approach to extract information from μ-X-ray Absorption Spectroscopy (XAS) based mapping techniques, where each pixel of a map contains full XANES (X-ray Absorption Near Edge Structure) information. Data reduction is performed thanks to specifically developed software, XASMAP, which allows automatic normalization, linear combination fits, map reconstruction and spectrum extraction. We illustrate an example of application on data acquired in a laser heated diamond-anvil cell, devoted to the investigation of the behavior of iron during the decomposition of (Mg,Fe)-ringwoodite into perovskite and ferropericlase at conditions relevant to Earth upper/lower mantle boundary. The analysis of 1600 Fe K-edge XANES spectra allows the reconstruction of maps based on iron-speciation, but it also drives to iron-concentration maps in a complex mixture of three crystalline phases. This analytical procedure opens the way toin situstudies at extreme conditions of pressure and temperature for the geosciences, physics and chemistry communities.