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ZEISS
6 Operation | 6.5 Finding Appropriate Detector Settings
6.5.8 Setting up the aSTEM/STEM Detector
The aSTEM/STEM detector is used for compositional imaging or topographical imaging of ultra-
thin specimens. The aSTEM/STEM detector is available either with one video output channel
(aSTEM1) or with four video output channels (aSTEM4). The aSTEM detector is optionally avail-
able.
The aSTEM/STEM detector is equipped with several separate diode segments. The signals of the
segments can individually be added to or subtracted from the output signal in order to allow dif-
ferent STEM imaging modes, e.g. bright field (BF) or oriented dark field (ODF). The most com-
monly used STEM imaging modes are predefined and can be selected from a drop-down menu in
the
STEM Control
panel.
Fig. 36: Asbestos, oriented darkfield (ODF) image captured with an
image showing real information about bending and lattice defects within each fiber (right).
STEM Control
STEM imaging mode
Output signal
BF
S1
DF
S2 + S3
ODF
S2 - S3
ODF90°
S3 - S2
ODF + BF
S1 + S2 - S3
ODF90° + BF
S1 - S2 + S3
BF + DF
All on
User defined name
Custom combination of
segments
Active segments with +/-
signs
Custom combination of
segments.
"+" on, "-" inverted
Instruction Manual ZEISS Crossbeam 350 | en-US | Rev. 3 | 349500-8111-000
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