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An electrostatic multipole is defined by the command:
9 E(LECTROSTATIC) M(ULTIPOLE)
<effective length
of multipole in meter>
<VQ in kV at electrode>
<VH in kV at electrode>
<VO in kV at electrode>
<VD in kV at electrode>
<VZ in kV at electrode>
<aperture radius G0 in meter> ;
[example: E M 0.1 1.0 0 0 0 0 0.03 ;]
VQ, VH, VO, VD and VZ here are the quadrupole-, hexapole-,
octopole-, decapole- and dodecapole-components
of the electrode potential. For positive or negative
values of VQ, VH, VO, VD, VZ particles with
positive x-values are
driven towards or away from the optic axis, respectively.
Analogously to the magnetic case the
multipole-command is also applicable for a
pure quadrupole, hexapole, octopole, decapole or dodecapole.
However, to save computer time it is
advisable to use in such cases the following commands:
KPII
1999-10-20