Figure 1
From: Experimental phase determination of the structure factor from Kossel line profile
(a) Formation of Kossel lines. Fluorescent radiation emitted by the atoms (A0) in the sample interferes with its Bragg reflection (AB) resulting in strong intensity modulations (I = |A0 + AB|2) in the vicinity of cones defined by the normal of the diffracting plane (hkl) and the Bragg angle (θB). The viewing direction is in the diffracting planes (grey lines) but the cone is illustrated with an ellipse. Arrows indicate relevant direct (thick arrows) and reflected (thin arrows) plane-wave components of the spherical-wave fluorescent radiation. (b) Bragg and Laue case of Kossel lines. k0 and k1 wave vectors (see text for definition) are located on the same side of crystal surface for the Bragg case (red), while on the opposite sides for Laue case (blue). There exist pure Bragg, pure Laue and mixed Bragg-Laue cones (shown in the figure) depending on θB and φs (the angle between qhkl and the crystal surface normal). For more details see Supplementary Movie 2.
