Darwin curve

Darwin curve

[′där·win ‚kərv]
(crystallography)
A plot of the intensity of diffracted x-rays from a perfect crystal as a function of angle.
References in periodicals archive ?
However, the diffraction pattern of a perfect plane crystal, lies below the Darwin curve and has an asymmetrical shape due to absorption resulting from the complex nature of the refractive index, i.
Cauchois and Bonnelle [19] showed that the resulting Darwin curve for the bent crystal is made-up of adjacent rectangles of decreasing height as shown schematically in Fig.
This approach based on the addition of high energy offsets, is supported by the results by Cauchois and Bonnelle (19) who showed that the asymmetrical diffraction pattern for a bent monochromator can be approximated by a sum of adjacent rectangular Darwin curves with decreasing amplitudes.