Potocar T, Zawisky M, Lemmel H, Springer J, Suda M
Vienna University of Technology, Institute of Atomic and Subatomic Physics, A-1020 Vienna, Austria.
Acta Crystallogr A Found Adv. 2015 Sep;71(Pt 5):534-41. doi: 10.1107/S205327331501205X. Epub 2015 Jul 22.
This study investigates the phase shift induced by Laue transmission in a perfect Si crystal blade in unprecedented detail. This `Laue phase' was measured at two wavelengths in the vicinity of the Bragg condition within a neutron interferometer. In particular, the sensitivity of the Laue phase to the alignment of the monochromator and interferometer (rocking angle) and beam divergence has been verified. However, the influence of fundamental quantities, such as the neutron-electron scattering length, on the Laue phase is rather small. The fascinating steep phase slope of 5.5° [(220) Bragg peak] and 11.5° [(440) Bragg peak] per 0.001 arcsec deviation from the Bragg angle has been achieved. The results are analysed using an upgraded simulation tool.
本研究以前所未有的详细程度，对完美硅晶体薄片中劳厄透射引起的相移进行了研究。在中子干涉仪内，于布拉格条件附近的两个波长处测量了这种“劳厄相”。特别地，已验证了劳厄相对单色仪和干涉仪对准（摇摆角）以及光束发散的灵敏度。然而，诸如中子 - 电子散射长度等基本量对劳厄相的影响相当小。已实现了每偏离布拉格角0.001 弧秒就有5.5°[（220）布拉格峰]和11.5°[（440）布拉格峰]的迷人陡峭相斜率。使用升级后的模拟工具对结果进行了分析。
