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Updated: Aug 30, 2025

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
A velocity map imaging spectrometer for measuring absolute differential cross sections for ion-induced electron
N Sens1, M Ryszka1, J-C Poully1
1Centre de Recherche sur les Ions, les Matériaux et la Photonique (CIMAP), UMR 6252, Normandie Université, ENSICAEN, UNICAEN, CEA, CNRS, 14000 Caen, France.
Abstract:
In this paper, we present a newly developed crossed beam experimental setup that utilizes the velocity map imaging (VMI) technique to simultaneously measure both the kinetic energy and emission angle of electrons emitted from atoms or molecules upon ion collision. The projectile ion beam with keV to MeV kinetic energy orthogonally crosses the neutral target beam produced by an effusion cell. The emitted electrons are extracted and analyzed by a multi-electrode VMI spectrometer. By monitoring the target density, the projectile ion beam intensity, and the beams' overlap, we are able to measure absolute differential cross sections for collision-induced electron emission from molecules. The characterization of the setup and the methodology will be presented as well as first results for electron emission from uracil upon 0.98 MeV/u 12C4+ collision.
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