The Lens System
Figure 8: High Magnification Mode
Acceptance
Angle
Iris
Diameter
±1° 3.5mm
±2° 7mm
±3° 10mm
±4° 13mm
±5° 15.5mm
±6° 17.5mm
Table 1: Acceptance Angle vs. Iris Diameter for a Point Source
In the novel, angle-resolved Medium Area mode, electrons leaving the sample within a
given angular range are focused onto the same location of the analyzer entrance inde-
pendent of their position on the sample. The angular modes allow the user to optimize
the angular resolution down to ±0.05 ° with the Slit-Orbit mechanism. With a 2-D de-
tection system high angular resolution can be achieved in the dispersion direction of
PHOIBOS 15
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