International
Tables for Crystallography Volume C Mathematical, physical and chemical tables Edited by E. Prince © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. C, ch. 7.4, p. 662
Figure 7.4.4.1
P. Suortti^{c}


Figure 7.4.4.1
Equatorial phasespace diagrams for a conventional Xray source and parallelbeam geometry; x is the size and x′ = dx/dz the divergence of the Xrays. (a) Radiation distributions for two wavelengths, λ_{1} and λ_{2}, at the source of width Δx, and downstream at a slit of width ±s_{1}. (b) Acceptance and emittance windows of a flat perfect crystal, where the phasespace volume remains constant, Aw_{a}Δλ = Ew_{e}Δλ, and the (x′, λ) section shows the reflection of a polychromatic beam (Laue diffraction). (c) Distributions for one wavelength at the source, flat perfectcrystal monochromator, sample (marked with the broken line), and the receiving slit (RS); z is the distance from the source. 