19 April 2006 Femtosecond electron gun for diffraction experiments
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The concept of an electron gun for generating pulses with a duration <10 fs at energies suitable for electron diffraction experiments is presented. The principle is based on an rf cavity oscillating in the TM010 mode. Laser pulses for photoemission are injected at a well-defined phase of the rf oscillation such that electrons with different initial velocities and different time delays arrive at a target within a very small temporal window. Coulomb broadening is prevented by reducing the number of electrons to the level of a single electron per pulse while increasing the repetition rate to the MHz range. The fs-electron pulses generated will advance the time-resolution of electron diffraction experiments to the level of a vibrational period of molecules.
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Ernst Fill, Laszlo Veisz, Alexander Apolonski, Ferenc Krausz, "Femtosecond electron gun for diffraction experiments", Proc. SPIE 6194, Millimeter-Wave and Terahertz Photonics, 61940J (19 April 2006); doi: 10.1117/12.682975; https://doi.org/10.1117/12.682975

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