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For all standard applications the collector bias should be set to +300 V.
Negative
collector bias
Selecting a negative collector voltage generates a field deflecting the low energy SEs so that they
cannot reach the scintillator and do not contribute to the signal. Only high-energy BSEs reach the
scintillator contributing to the image generation.
This produces a pseudo-backscattered image, which shows pronounced topography, but largely
cancels surface properties and material contrast.
1
Preamplifier
4
Scintillator
2
Photomultiplier
5
Specimen
3
Light guide
6
Collector grid
Fig. 3.10: Schematics of the SE2 detector
Содержание Crossbeam 340
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