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3.4.5.2. SE2 detector
The SE2 detector (
3
) is a Everhart-Thornley type detector. It detects SEs as well as BSEs.
Electrons moving to the detector are attracted by the collector grid (
2
) and directed to the scintil-
lator. The collector voltage can be varied in the range between -250 V and + 400 V. This collector
voltage generates an electrical field in front of the detector thus directing the low energy SEs to-
wards the scintillator.
For all standard applications the collector voltage should be set to +300 V.
Fig. 3.7: Schematics of the SE2 detector
Negative
collector volt-
age
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 so-called pseudo-backscattered image, which shows pronounced topography,
but largely cancels surface properties (edge contrast).
1
Specimen
3
SE2 detector
2
Collector grid
4
Objective lens
1
2
3
4
Содержание AURIGA Compact Crossbeam
Страница 1: ...AURIGA Compact Crossbeam workstation Instruction Manual ...
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