镶嵌晶体模型在计算KAP积分反射率中的应用

Application of Mosaic Crystal Model in Calculation of Integrated Reflectivity for KAP

为了提高0.2～2nm软X-射线的空间分辨率,用晶格常数在纳米量级的LiF、PET、Mica和酞酸钾(KAP)四种晶体代替衍射光栅作色散元件。根据镶嵌晶体模型理论和量子散射理论,计算了KAP的积分反射率,计算结果表明KAP的积分反射率与波长有关,在0.61～2.23nm软X-射线范围内,KAP的积分反射率先随波长变长而降低,后随波长变长而升高,在1.83nm处的积分反射率最低,而能量分辨率在0.61～2.23nm软X-射线范围内一直随波长变长而降低。

In order to increase spatial resolution for soft X-ray in 0.2~2 nm region, LiF, PET, Mica and KAP are used as dispersive elements in place of diffrative grating. Lattice constant of these crystals is in nanometer level. Integrated reflectivity of KAP is calculated by mosaic crystal model and quantum dispersion theory. Calculation results show that integrated reflectivity of KAP is related to wavelength. It firstly falls down, then rises as wavelength increases in 0.61~2.23 nm region, and it is minimum at 1.83 nm. However, energy resolution falls down all along in 0.61~2.23 nm region.