Monochromatic diffraction geometries

Figure 2.7 Si 220 reflection with a plane incident monochromatic wave, (a) duMond diagram showing the angle at which the wave will diffract, and a 2° angular aperture that easily allows it to pass, (b) the corresponding real-space geometry...

Figure 1. X-ray patterns of calcined MSU-1 and -4 Silica obtained with Tergitol 15S12 and Tween 20 as templating agents. The patterns were recorded with a Bruker D5000 diffractometer in Bragg-Brentano reflection geometry. Cu-L radiation was employed that was monochromatized by a graphite single crystal in the diffracted beam.

Examples of diffuse diffraction patterns in monochromatic geometry 323... 

EXAMPLES OF DIFFUSE DIFFRACTION PATTERNS IN MONOCHROMATIC GEOMETRY... 

A diffraction line may be broadened as a result of instrumental effects, such as an imperfection in the collimation geometry, the finite width of the detector window, imperfect focusing, less than perfect monochromatization of the incident beam, etc. Suppose that I(s) represents the intensity pattern that could be obtained under an ideal instrumental condition producing no instrumental broadening, and f0bs(s) represents the smeared intensity pattern that is actually observed. The relationship between these two can be expressed in most cases as... 

The two most commonly used geometries for obtaining x-ray diffraction data in home laboratories are shown in Fig. 3. In the simplest "reflection" or Bragg-Brentano setup (Fig. 3a), one has an x-ray line source at 3. A flat plate sample is mounted at 4 and a point detector at 6. The sample is scanned through 0 degrees as the detector is moved through 20. The most common laboratory x-ray source is a sealed Cu tube. To produce monochromatic... 

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