Phys. Rev. Lett. 48, 1487–1489 (1982)Invariant-Phase Information of X-Ray Structure Factors in the Two-Beam Bragg Intensity near a Three-Beam PointReceived 29 March 1982; published in the issue dated 24 May 1982 Dynamical theory yields a simple expression for the integrated intensity I0H of a symmetric two-beam Bragg reflection versus azimuthal angle around H⃗, perturbed to first order as another reciprocal lattice point L⃗ approaches the Ewald sphere. Around the three-beam point I0H shows pronounced asymmetry sensitive to the magnitude and phase of the product of all three structure factors. The fully quantitative description allows optimization of the conditions for determination of that phase. It applies regardless of inversion symmetry. © 1982 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.48.1487
DOI:
10.1103/PhysRevLett.48.1487
PACS:
61.10.Dp
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