I'm looking for images of electron or ion beams recorded (from the side) using electrons, for example with a transmission electron microscope. Does anybody have references to publications?
What do you mean under "images of electron or ion beams" physically? A kind of Ronchigram for a system without a solid target - beam-beam interaction? I am afraid, it it just fundamentally impossible to visualize such effects for typical current density and beam diameters in conventional electron microscopes. Perhaps, you meant something other.
I actually mean that the electron or ion beam should be the specimen. Ideally the particle beam should go through the specimen area of a TEM orthogonally to the column of the TEM. One should see the electrostatic potential of the beam in a phase contrast image or a hologram. A beam of 1 keV electrons with a current of a few nA, focussed to about 100 nm diameter should be visible, I think. Obviously one would need a TEM with a FIB or focussed e-beam attached to the specimen port to do this.
Yes, that's very interesting! If I understand correctly the variation in the electric field produced by the plasma wave introduces a phase-modulation (via the momentum modulation) in the electron pulse used as probe. This leads to a detectable intensity modulation in the electron pulse simply due to free space propagation. That's definitely an example of phase contrast imaging of an electric field distribution.
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