1 September 1995 High-repetition-rate time-resolved gas phase electron diffraction
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Multiphoton emission and space-charge effects require the generation of electron pulses for ultrafast time-resolved electron diffraction experiments to be performed with low power lasers. Using mode-locked laser sources it is possible to generate a train of electron pulses containing several nanoamperes, while simultaneously minimizing the number of electrons per pulse. Experiments with CCl4 demonstrates that this electron beam current is sufficient to record diffraction patterns from gas phase samples in modecular beams. To observe time dependent structural data one must subtract the diffraction signal obtained when the pump laser is on from that with the pump laser off. This imposes stringent requirements on the system noise and drift. We present a scheme to stabilize the electron current to 0.1%, and discuss a fast-gated detection scheme to subtract diffraction patterns while maintaining single particle counting efficiency.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Joseph D. Geiser, Joseph D. Geiser, Peter M. Weber, Peter M. Weber, "High-repetition-rate time-resolved gas phase electron diffraction", Proc. SPIE 2521, Time-Resolved Electron and X-Ray Diffraction, (1 September 1995); doi: 10.1117/12.218345; https://doi.org/10.1117/12.218345

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