Emission starts from within the excitation volume in the material. Looking from the top, this volume can be much bigger than the spatial extent of the point in the CL map for which the intensity is recorded.
Hence, a bright point (pixel) in CL map does not mean that 'higher emission is generated from that particular point' but rather 'it is from the larger excitation volume associated with that smaller point'. Is it correct?
Roman Kubrin
In general, it is hardly true. Brightness of a point depends on the local chemical composition and crystallinity in a not straightforward way and the increased penetration depth of the electron beam alone does not necessarily lead to more intensive emission.
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