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In addition to the amplitude information, phase information can also be obtained from a generalized diffraction experiment (in spite of the inability of the detector to observe phases directly) on condition that the primary ray can be controlled in a defined way. A single diffraction pattern suffices for the determination of the phases except in the case of a centre of symmetry in real space, and the combination of at least two patterns removes this ambiguity.

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English translation (2024) by Wai Li Ling, Martin Byrdin and Julio Cesar Da Silva, with help from free versions of DeepL and Google Translate.

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