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i. structure factor. r. F hkl. f. electron density. Crystallography. | F hkl | (amplitude). ϕ hkl (phase). i ϕ. Centrosymmetric structures ϕ = 0 or π Non-centrosymmetric structures ϕ = 0 - 2π.
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i structure factor r Fhkl f electron density Crystallography |Fhkl | (amplitude) ϕhkl (phase) iϕ Centrosymmetric structures ϕ = 0 or π Non-centrosymmetric structures ϕ = 0 - 2π