Multi-electron/ ion coincidence spectroscopy in Xe triple ionization

The study of atomic multiple photoionization by a single photon can be performed by detecting in coincidence all the corresponding electrons with a magnetic bottle time of flight spectrometer. To reveal minor triple ionization channels of Xe atom that are hindered by radom coincidences, we have detected three electrons in coincidence with the corresponding Xe3+ ion, thanks to a new permanent magnet design using a drilled soft iron pole.