2014/12/31 by Lutz Waldecker, Roman Bertoni, Ralph Ernstorfer · 2 citations
Biochemistry, Genetics and Molecular Biology · Engineering · Materials Science · Physics and Astronomy · #Advanced Electron Microscopy Techniques and Applications #Bunches #Diffractometer #Electron #Electron and X-Ray Spectroscopy Techniques #Femtosecond #Particle Accelerators and Free-Electron Lasers #Pulse (music) #Pulse duration #physics.acc-ph #physics.ins-det
paper · pdf · doi:10.1063/1.4906786
published as J. Appl. Phys. 117, 044903 (2015) · 5 pages, 3 figures
openalex publication_date 2015/01/28 · arxiv created 2015/11/27 · arxiv updated 2015/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present the design and implementation of a highly compact femtosecond electron diffractometer working at electron energies up to 100 keV. We use a multi-body particle tracing code to simulate electron bunch propagation through the setup and to calculate pulse durations at the sample position. Our simulations show that electron bunches containing few thousands of electrons per bunch are only weakly broadened by space-charge effects and their pulse duration is thus close to the one of a single-electron wavepacket. With our compact setup, we can create electron bunches containing up to 5000 electrons with a pulse duration below 100 fs on the sample. We use the diffractometer to track the energy transfer from photoexcited electrons to the lattice in a thin film of titanium. This process takes place on the timescale of few-hundred femtoseconds and a fully equilibrated state is reached within 1 ps.