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Journal Article

Electron gun for diffraction experiments off controlled molecules


Müller,  Nele L. M.
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science, DESY, Notkestrasse 85, 22607 Hamburg, Germany;

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Müller, N. L. M., Trippel, S., Długołȩcki, K., & Küpper, J. (2015). Electron gun for diffraction experiments off controlled molecules. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(24): 244001. doi:10.1088/0953-4075/48/24/244001.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-57EA-3
A dc electron gun, generating picosecond pulses with up to 8 × 106 electrons per pulse has been developed. Its applicability for future time-resolved diffraction experiments on state- and conformer-selected laser-aligned or oriented gaseous samples was characterized. The focusing electrodes were arranged in a velocity-map imaging spectrometer configuration. This allowed us to directly measure the spatial and velocity distributions of the electron pulses emitted from the cathode. The coherence length and pulse duration of the electron beam were characterized by these measurements combined with electron trajectory simulations. Electron diffraction data from a thin aluminum foil illustrated the coherence and resolution of the electron-gun setup.