Design of a miniature picosecond low-energy electron gun for time-resolved scattering experiments

Design of a miniature picosecond low-energy electron gun for time-resolved scattering experiments

We present the design and performance tests of a miniaturized pulsed low-energy electron gun. Electrons photoemitted from a gold cathode are accelerated over a distance of 75 μm and then collimated by a microchannel plate. According to calculations, this novel concept will allow the time spread of t...

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Veröffentlicht in:Review of scientific instruments 2001-12, Vol.72 (12), p.4404-4407
Hauptverfasser: Karrer, R., Neff, H. J., Hengsberger, M., Greber, T., Osterwalder, J.
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container_end_page 4407
container_issue 12
container_start_page 4404
container_title Review of scientific instruments
container_volume 72
creator Karrer, R.
Neff, H. J.
Hengsberger, M.
Greber, T.
Osterwalder, J.
description We present the design and performance tests of a miniaturized pulsed low-energy electron gun. Electrons photoemitted from a gold cathode are accelerated over a distance of 75 μm and then collimated by a microchannel plate. According to calculations, this novel concept will allow the time spread of the electron pulses to be kept below 5 ps for kinetic energies as low as 100 eV. The achievement of a minimum angular beam divergence (≈1°) along with an energy resolution of 1.1 eV has to be paid for by low signal intensities. We demonstrate the performance of the gun and the high electron-beam coherence by presenting low-energy-electron diffraction images taken from a submonolayer of lead adsorbed on the germanium (111) surface. We anticipate that this electron gun will open up new possibilities for following structural changes on solid surfaces in real time.
doi_str_mv 10.1063/1.1419219
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title Design of a miniature picosecond low-energy electron gun for time-resolved scattering experiments
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