FLAT AND SPHERICALLY BENT MUSCOVITE (MICA) CRYSTALS FOR X-RAY SPECTROSCOPY
FLAT AND SPHERICALLY BENT MUSCOVITE (MICA) CRYSTALS FOR X-RAY SPECTROSCOPY
复制标题
用于 X 射线光谱的扁平和球形弯曲白云母 (云母) 晶体
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
T. Shelkovenko
中科院分区：
文献类型：
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作者：
G. Hölzer;O. Wehrhan;J. Heinisch;Eckhart Förster;T. Pikuz;A. Faenov;S. Pikuz;V. Romanova;T. Shelkovenko
晶体应用于定量X射线光谱的基本参数是晶体的波长上限和定量反射特性（固有分辨能力、发光度）。由于大的晶格常数，白云母，云母族矿物，可以在高达约2nm的波长范围内使用。白云母晶体可以弯曲到小的曲率半径，由于其有利的解理和弹性性能。从理论和实验上研究了反射002 - 00 24处的特征反射特性。计算了曲率半径为R = 100和R = 186 mm的白云母晶体的各种反射的积分反射率。用X射线管中的CuKα和MoKα辐射测量了平面晶体在反射00 10 - 00 26中的辐射，并与完整晶体和镶嵌晶体的计算结果进行了比较。可用的高质量白云母晶体具有镶嵌结构，其镶嵌展度约为1弧分。这种镶嵌扩展限制了高反射阶的光谱分辨能力。
Essential parameters for the application of crystals to quantitative X-ray spectroscopy are the upper wavelength limit and the quantitative reflection properties (intrinsic resolving power, luminosity) of the crystal. Due to the large lattice constant, muscovite, a mica group mineral, can be used in the wavelength range up to about 2nm. Muscovite crystals can be bent to small radii of curvature due to their favourable cleavage and elastic properties. Characteristic reflection properties at reflections 002 – 00 24 were investigated theoretically and experimentally. The integrated reflectivity was calculated for various reflections of perfect flat as well as spherically bent muscovite crystals with curvature radii R = 100 and R = 186mm. It was measured for flat crystals in the reflections 00 10 – 00 26 using CuKα- and MoKα-radiation from X-ray tubes and compared with calculations for both perfect and mosaic crystals. Available high-quality muscovite crystals have a mosaic structure with a mosaic spread of about 1 arcmin. This mosaic spread limits the spectral resolving power for high reflection orders.