High Definition X-Ray Fluorescence: Principles and Techniques

Table 1

Selected monochromator crystals with selected d-spacings and reflection widths for 1 Å(12.4 keV) X-rays.

Crystal	Reflection	d-spacing (nm)	Refl. width (𝜇rad)	Intrinsic resolution, 𝛿𝜏
Silicon	(111)	0.31355	22.3	1.36×10^−4
	(220)	0.19201	15.8	5,37 ×10^−5
Germanium	(111)	0.32664	50.1	3.1×10^−4
	(220)	0.20002	37.4	1.37×10^−4
Diamond	(111)	0.20589	15.3	5.8×10^−5
	(400)	0.089153	5.2	7.4×10^−6
Graphite	(0002)	0.3354	Sample dependent	Sample dependent