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I got a question about the origin of reciprocal space..what is the physical nature of the special point? Does that originate from diffraction? or Is that a diffraction points? We know that a 'normal' reciprocal point designates a group of parallel plane. How about the origin of reciprocal space?

In a powder diffraction, we observed only ONE origin of reciprocal space from a huge number of small single crystals. By contrast, the other points which correspond to a CERTAIN plane form a sphere surrunding the origin of reciprocal space..Why does all the origin of reciprocal space for all the single crystal in the power sample come into one point? What factors determine the location of the special point? Is that associated with the direction of the incident beam? Thank you.