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X-ray interference fringes from a weakly bent plane-parallel crystal with negative strain gradient
Acta Crystallographica Section A Foundations and Advances Pub Date : 2019-10-07 , DOI: 10.1107/s2053273319011859
Tomoe Fukamachi , Sukswat Jongsukswat , Dongying Ju , Riichirou Negishi , Keiichi Hirano , Takaaki Kawamura

Under the anomalous transmission condition in the Bragg mode, X-ray interference fringes were observed between two beams with different hyperbolic trajectories in a very weakly bent plane-parallel perfect crystal with negative strain gradient. The origin of the fringes was analysed based on the dynamical theory of diffraction for a distorted crystal. In the reflected beam from the entrance surface, the interference fringes were observed between once- and twice-reflected beams from the back surface. In the transmitted beam from the back surface, the interference fringes were observed between the direct beam and once-reflected beam from the entrance surface. In the emitted beam from the lateral surface, the interference fringes were observed between the beams after different numbers of reflections in the crystal. The multiply reflected beams were formed by a combined result of long propagation length along the beam direction with large divergence of the refracted beams when the strain gradient was negative. The period of these interference fringes was sensitive to very weak strain, of the order of 10−7.

中文翻译:

负应变梯度弱弯曲平面平行晶体的 X 射线干涉条纹

在布拉格模式反常传输条件下,在具有负应变梯度的极弱弯曲平面平行完美晶体中,在具有不同双曲线轨迹的两束光束之间观察到X射线干涉条纹。基于畸变晶体的衍射动力学理论分析了条纹的起源。在来自入射面的反射光束中,在来自背面的一次反射光束和两次反射光束之间观察到干涉条纹。在来自背面的透射光束中,在直射光束和来自入射面的一次反射光束之间观察到干涉条纹。从侧面发射的光束中,在晶体中经过不同次数的反射后,在光束之间观察到干涉条纹。当应变梯度为负时,多重反射光束是由沿光束方向的长传播长度和大发散度的折射光束共同形成的。这些干涉条纹的周期对非常弱的应变敏感,大约为 10−7
更新日期:2019-10-07
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