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各位老师好，学生阅读论文时发现论文中观察钐钴合金孪晶间的反相畴时有这一段描述，These faults are found to lie on the prism planes of
the crystal and go out of contrast for diffracting conditions (7) such that g.R = 0 or an integer. the fringe contrast appears only when a systematic row with a higher order reflection (n ~ 4) has been excited. Such contrast is consistent for faults having a 1/4 <10-10> displacement vector.
high order 指的是高阶劳厄斑吗？这种衍衬观察是否与一般的分析无异？透射作高阶劳厄斑衍射有什么要求呢？谢谢各位老师答惑