Links in this section:

Introduction
Evolution of WDS technique
Basics of WDS
Diffraction
Crystals
Detectors & Geometry
Comparison of EDS and WDS
Qualitative Analysis
Quantitative Analysis
Mapping
Summary

Mapping

When the spectrometer is positioned on a peak, the output pulses can be used for mapping. Although only one element can be mapped at a time, the significant benefit of using the WD signal is its much improved peak to background ratio. The analyst needs to be aware of the limitations of WD mapping at low magnification. If the beam is scanned over a large area, there will be some positions near the edge of the field where the conditions for diffraction are not met. This will result in lost intensity which could result in misinterpretation of the map. In practice, the effect is not noticeable provided the magnification is 500x or above.

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