Study on local electronic states of transition metal atoms occupied the centers of octahedral and tetrahedral structures by ATS scattering

2002年，我们对赤铁矿(Fe_2O_3)和埃斯科莱石(Cr_O_3)进行了研究，它们属于同一晶体结构，刚玉结构。我们使用图库巴光子工厂的同步加速器光束测量了这些晶体在铁或铬的 K 吸收边缘附近的 ATS 散射。主要结果如下1）在边缘下方，两种晶体中都观察到了（003）和（009）ATS强度2）赤铁矿ATS峰的方位角依赖性表现出三保持对称性3）另一方面，在Eskolatie中观察到六保持对称性4）从方位角依赖性，我们得出结论，ATS散射是由四极-四极和四极杆的干涉引起的赤铁矿中的偶极-四极转变5) 在Eskolaite 中，ATS 散射是由于四极-四极转变6) 在赤铁矿中，在远离边缘的地方观察到ATS 强度的双保持方位角依赖性7) 但是，在Eskolaite 中，我们没有观察到这种非共振ATS 散射8) 我们得出结论，这些非共振ATS 散射是由于磁散射以及赤铁矿和Eskolaite 中的差异引起的通过它们的磁性结构

In 2002, we studied on Hematite (Fe_2O_3) and Eskolaite (Cr_O_3), which belong to the same crystal structure, corundum structure. We measured ATS scattering from these crystals near the K-absorption edge of Fe or Cr, using synchrotron beams in Photon Factory in Tukuba. The main results are the following1) Just below the edges, (003) and (009) ATS intensities were observed in both crystals2) The azimuthal dependence of the ATS peaks from Hematite showed three-hold symmetry3) On the other hand, six-hold symmetry was observed in Eskolatie4) From the azimuthal dependence, we conclude that the ATS scattering is caused by interference of quadrupole-quadrupole and dipole-quadrupole transitions in Hematite5) In Eskolaite, the ATS scattering is due to quadrupole-quadrupole transition6) In Hematite, two-hold azimuthal dependence of the ATS intensity was observed far from the edge7) But, in Eskolaite, we did not observe such non-resonant ATS scattering8) We conclude these non-resonant ATS scattering is due to the magnetic scattering and the difference in Hematite and Eskolaite caused by their magnetic structure