Effect of interfacial roughness correlation on diffuse scattering intensity in a neutron supermirror
Effect of interfacial roughness correlation on diffuse scattering intensity in a neutron supermirror
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DOI：
10.1063/1.3108542
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发表时间：
2009-04
影响因子：
3.2
通讯作者：
R. Maruyama;Dai Yamazaki;T. Ebisawa;K. Soyama
中科院分区：
文献类型：
--
作者：
R. Maruyama;Dai Yamazaki;T. Ebisawa;K. Soyama
中子超反射镜是中子束传输、弯曲和聚焦的重要器件。从超镜反射的中子被分为镜面和非镜面（漫反射）分量。漫射分量的抑制是重要的，因为它降低了信噪比，当超反射镜用于聚焦系统中用于诸如小角度散射测量的目的时，这是一个严重的问题。采用NiC/Ti多层膜代替传统的Ni/Ti多层膜，可以使扩散强度降低一个数量级以上。为了深入了解控制超反射镜扩散强度的机制，研究了Ni和NiC单层的晶体结构以及Ni/Ti和NiC/Ti多层膜的界面结构。在NiC单层的微晶尺寸被发现是小于在Ni单层的4.1倍，通过X射线衍射测量。对Ni/Ti和NiC/Ti多层膜的界面结构进行了分析。
Neutron supermirrors are increasingly important devices for transporting, bending, and focusing neutron beams. Reflected neutrons from a supermirror are divided into specular and off-specular (diffuse) components. Suppression of the diffuse component is important since it reduces the signal-to-noise ratio, a serious problem when a supermirror is used in a focusing system for purposes such as small angle scattering measurements. The diffuse intensity can be decreased by more than one order of magnitude by adopting NiC/Ti multilayers instead of conventional Ni/Ti multilayers. In order to obtain insight into the mechanism that controls the diffuse intensity from a supermirror, the crystal structure of Ni and NiC monolayers and the interface structure of Ni/Ti and NiC/Ti multilayers were investigated. The crystallite size in the NiC monolayer was found to be smaller than that in the Ni monolayer by a factor of 4.1 by x-ray diffraction measurement. The interface structure of the Ni/Ti and NiC/Ti multilayers wa...