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6.6.6.3. Adjusting a high probe current (nA)
For the higher currents (nA range) usually the largest apertures need to be selected. It is very dif-
ficult to achieve a circular beam profile without halo by using the Focus wobble
procedure.
Precondition:
•
Piece of silicon is loaded
•
Probe currents have been adjusted roughly as described for pA probe currents (see previous
section).
Procedure:
1
Burn a spot into the specimen for about
5 s
:
Use the
Spot
mode.
2
Check the halo.
3
If the spot is not round, move the aperture one
step in one direction.
4
Burn a new spot.
5
If the halo is reduced, continue moving the
aperture in this direction.
If the halo is increased, move the aperture in
the opposite direction.
6
Repeat steps 4 to 5 until the burned spot is
round.
Содержание AURIGA Compact Crossbeam
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