Electron gun for diffraction experiments off controlled molecules
| Autor: | Müller, Nele Lotte Marie, Trippel, Sebastian, Dlugolecki, Karol, Küpper, Jochen |
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| Jazyk: | angličtina |
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| ISSN: | 0953-4075 |
| Popis: | Journal of physics / B 48(24), 244001(2015). doi:10.1088/0953-4075/48/24/244001 special issue: "Imaging the dynamic structure of matter: ultrabright x-ray and electron sources and their applications to biology, chemistry and condensed matter physics" A dc electron gun, generating picosecond pulses with up to $8\times10^6$ electrons per pulse, was 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 to directly measure the spatial and velocity distributions of the electron pulses emitted from the cathode. In combination with electron trajectory simulations, this permitted the characterization of the electron beam in terms of coherence length and pulse duration. Electron diffraction data of a thin aluminum foil illustrated the diffraction capabilities of the electron-gun setup. Published by IOP Publ., Bristol |
| Databáze: | OpenAIRE |
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