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Wei Group

Fudan University

In our group, we focus on the various interactions between ions and atoms/ molecules. By studying single and multiple electron capture events we aim to determine electron capture cross sections as a function of the ion impact energy. Using a reaction microscope the three dimension momenta of the projectile ions, the recoil ions and the free electrons can be measured in multi-coincidence for the interaction of ions with atoms/molecules. Then, both the transfer ionization cross sections and state-selective differential cross sections can be deduced. The systematic results expected from this project can help theorist to check the validity of their many-body theories and also can provide high accuracy atomic data for plasma physics. We are also interested in the fragmentation dynamics of molecules following impact by different projectiles, e.g., electrons or ions.

ECRs (electron cyclotron resonance source) as highly charged ion source have previously been widely used in these fields of research. With a high voltage platform, the beam energy can be up to hundreds of keV, depending on the charge of the ion. Recently a highly charged ion platform, based on an ECR ion source, has been constructed at Fudan University. An all permanent magnet 14.5 GHz ECR ion source has been installed on a high voltage platform (150 kV) to provide large currents of multiply charged ion beams. Currently beams of highly charged ions based on gaseous elements, e.g. (H, C, N, O and inert gas) beams can be readily supplied.

Cold Target Recoil Ion Momentum Spectrometer (COLTRIMS)
Cold Target Recoil Ion Momentum Spectrometer (COLTRIMS).
150 kV Highly Charged Ion Platform at Fudan University
150 kV Highly Charged Ion Platform at Fudan University.

Baoren WEI
Group Website

  • [1] Y. Zhang et al., "Three-body fragmentation of methane dications produced by slow Ar8+ – ion impact", Physical Review A 97, 022703 (2018). [link to article]
  • [2] W. Yu et al., "Collision cross sections of N2 by H+ impact at keV energies within time-dependent density-functional theory", Physical Review A 97, 032706 (2018). [link to article]


Argon Carbon COLTRIMS Cross Section Measurements EBIT Electron – Ion Collisions Electron – Ion Recombination Electron Capture Electron Impact Excitation Electron Impact Ionization Experiment Heavy Particle Collisions Highly Charged Ions Hydrogen (1H) Ion Beams Neon Nitrogen Oxygen X-Ray Spectroscopy