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An optically focusing X-ray diffraction camera is used to obtain low angle diffraction photographs. Focusing is accomplished by total external reflection either by one elastically bent optical flat to form a line focus, or by two crossed flats to form a point focus. The beam is partially monochromatized and its intensity is high. Spacings greater than 600 Å have been resolved.
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A. Franks (1955) studied this question.
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