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Electron and Ion Spectrometer

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Electron and Ion Spectrometer

This experimental apparatus is used to measure absolute differential cross section (d2σ/dEdθ) for collision-induced electrons or ion emission from atomic or molecular targets. The projectile ion beam crosses orthogonally an effusive atomic or molecular jet created from a gaseous or liquid sample. The collision-induced products (electrons, anions or cations) are selected according to their kinetic energy per charge (E/q) ratio by means of a 45° parallel-plate electrostatic analyzer. This spectrometer has an energy resolution of 5% and an angular acceptance of 2°. It is mounted on a rotatable ring for setting the observation angle θ (20° < θ < 130°). When detecting anions, the set-up is modified to avoid electron contamination. At the entrance and the exit of the spectrometer magnetic fields of 10-4 T are applied to filter out electrons with kinetic energies below 2 keV. The magnetic fields are provided by pairs of coils which are designed to minimize the residual field inside the electrostatic analyzer.

Contact : Jean-Yves Chesnel, François Frémont, Violaine Vizcaino

Recent publications
J.-Y. Chesnel et al. Physical Review A 91 (2015) 060701(R)
doi : 10.1103/PhysRevA.91.060701
E. Lattouf et al. Physical Review A 89 (2014) 062721
doi : 10.1103/PhysRevA.89.062721
Z. Juhasz et al. Physical Review A 87 (2013) 032718
doi : 10.1103/PhysRevA.87.032718

PhD thesis :
2013 - Elie Lattouf - Etude expérimentale de la formation de l’ion d’hydrogène négatif lors de collisions entre un ion positif et une cible atomique ou moléculaire
https://tel.archives-ouvertes.fr/tel-00917600