Double Wien-filter "Spot-IN and Spot-Out system"
The 1st Wien-filter and the electro-static lens produces a focus with energy dispersion of 12.3 μm/eV at the slit plane. At this plane, the electron beam is monochromated by inserting the slit of several widths ranging from few microns to sub microns. The 2nd Wien-filter cancels the energy-dispersion and produces an achromatic and stigmatic focus at exit plane, resulting in the roundly probe on the specimen plane. Thus, since a spot beam from Schottky source becomes a spot again at the exit after the monochromation, we named this monochromator system "Spot-IN and Spot-OUT system".
Sophisticated Octopole Wien-filter
The sophisticated Octopole Wien-filter produces homogeneous dipole field with no undesireble hexapole field from inhomogeneity of dipole field.
Arranged between Schottky source and accelerator
With a preset monochromator setting works universally on every accelerating voltages, since the accelerator is located after the monochromator and axial potential of the monochromator is kept constant.
Mukai M, et al.: (2014) , Ultramicroscopy 140: 37–43.
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