Abstract: We report high-resolution measurements of ultracold neutron reflection on mirrors as well as of diffraction by a ruled reflection grating. This work crucially depends on the very high resolution provided by the 'gravity diffractometer' for ultracold neutrons (UCN) installed at the UCN Turbine Source of the Institut Laue-Langevin. The samples employed consist of glass, nickel-coated glass, a Fomblin liquid mirror and a ruled optical diffraction grating. The main results are as follows: (1) The reflectivity data for the Fomblin oil is in excellent agreement with the Fresnel formula of elementary analysis while solid mirrors show significant deviations. (2) A detailed line profile analysis for zero-order diffraction on the grating shows no measurable deviation (at the level of 2 $MUL 10$+$MIN@11$/ eV in line broadening) from the reflection profile for a solid mirror.!17
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机译：摘要：我们报告了对超冷中子在镜子上的反射以及通过直纹反射光栅进行的衍射的高分辨率测量。这项工作至关重要地取决于“重力衍射仪”所提供的非常高分辨率，该分辨率用于安装在Laue-Langevin研究所的UCN涡轮源上的超冷中子（UCN）。所用样品由玻璃，镀镍玻璃，Fomblin液镜和直纹光学衍射光栅组成。主要结果如下：（1）Fomblin油的反射率数据与元素分析的菲涅耳公式非常吻合，而固体镜则显示出明显的偏差。 （2）对光栅零级衍射的详细线轮廓分析表明，与实心镜的反射轮廓没有可测量的偏差（在2 $ MUL 10 $ + $ MIN @ 11 $ / eV线宽范围内） 。！17
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