Linear polarization scans for resonant X-ray diffraction with a double-phase-plate configuration.
Linear polarization scans for resonant X-ray diffraction with a double-phase-plate configuration.
复制标题
使用双相位板配置进行共振 X 射线衍射的线性偏振扫描。
DOI：
10.1107/s0909049509035006
复制
发表时间：
2009
影响因子：
2.5
通讯作者：
F. de Bergevin
中科院分区：
文献类型：
--
作者：
V. Scagnoli;C. Mazzoli;C. Detlefs;P. Bernard;A. Fondacaro;L. Paolasini;F. Fabrizi;F. de Bergevin
本文介绍了一种结合共振X射线衍射实验进行偏振扫描的真空双位相板衍射仪。两个相位板的使用使得能够校正由于光束的发散及其能量扩散而引起的一些像差效应。因此，与仅具有单个延迟器的系统相比，获得了更高的旋转偏振速率。因此，可以使用更薄的相位板来获得所需的旋转极化率。这些结果对于在低能量（例如4keV）下的应用是特别有趣的，其中由于相位板的吸收在这些实验的可行性中起关键作用。在UO（2）上的铀M（4）边通过极化扫描的测量使材料中的磁和四极有序的贡献被解除纠缠。
An in-vacuum double-phase-plate diffractometer for performing polarization scans combined with resonant X-ray diffraction experiments is presented. The use of two phase plates enables the correction of some of the aberration effects owing to the divergence of the beam and its energy spread. A higher rate of rotated polarization is thus obtained in comparison with a system with only a single retarder. Consequently, thinner phase plates can be used to obtain the required rotated polarization rate. These results are particularly interesting for applications at low energy (e.g. 4 keV) where the absorption owing to the phase plate(s) plays a key role in the feasibility of these experiments. Measurements by means of polarization scans at the uranium M(4) edge on UO(2) enable the contributions of the magnetic and quadrupole ordering in the material to be disentangled.