论文标题
柔软X射线的石英晶体光学常数的各向异性
The anisotropy in the optical constants of quartz crystals for soft X-rays
论文作者
论文摘要
Y-CUT SIO $ _2 $晶体表面的折射率是根据依赖于偏振的软X射线反射仪测量值从45 eV到620 eV的。由于（100）和（001）方向上晶体结构的各向异性，我们观察到在Si-L $ _ {2,3} $和O-K吸收边缘处测得的反射率的显着偏差。从头算，O-K边缘的伯特 - 盐方程计算也证实了从这些数据重建的光学常数中的各向异性。这个新的实验数据集大大扩展了石英光学常数的现有文献数据，尤其是在近边缘地区。
The refractive index of a y-cut SiO$_2$ crystal surface is reconstructed from polarization dependent soft X-ray reflectometry measurements in the energy range from 45 eV to 620 eV. Due to the anisotropy of the crystal structure in the (100) and (001) directions, we observe a significant deviation of the measured reflectance at the Si-L$_{2,3}$ and O-K absorption edges. The anisotropy in the optical constants reconstructed from these data is also confirmed by ab initio Bethe-Salpeter Equation calculations of the O-K edge. This new experimental dataset expands the existing literature data for quartz optical constants significantly, particularly in the near-edge regions.
