Three-Electron Auger Process from Beam-Foil Excited Multiply Charged Ions

Abstract

Electron emission from collisions of C3+ ions (22.7 A MeV) with carbon foils (21, 49 and 90 microg/cm(2)) was studied by the time-of-flight method. Two prominent emission patterns can be readily identified as "binary encounter" electrons and "cusp" electrons. With the thinnest target only, a third structure is visible at slightly lower time-of-flight (thus slightly higher energy) than the cusp electrons. The energy of these electrons would correspond to 647(+116)/(-104) eV if they were emitted from the projectile frame of reference. A possible explanation is a rare three-electron-Auger K(2)L(2)L(1) process.

Charging of insulators by multiply-charged-ion impact probed by slowing down of fast binary-encounter electrons

“…The studies focused on binary-encounter electrons [11,14], convoy electrons [13,15], fast electrons produced by the "Fermi shuttle" mechanism [12,13], and also Auger electrons from the in-flight deexcitation of electroncarrying projectiles [15]. After a pilot experiment at Grand Accelerateur National d'Ions Lourds (Caen) [16], dedicated experiments on charging-up phenomena were conducted at the CS (Superconductor Cyclotron) of Istituto Nazionale di Fisica Nucleare-LNS (Catania) with insulating foils.…”

Triple ionization of CO2 by valence and inner shell photoionization

“…27 It has been pointed out that a concerted process should exist in which double core holes are filled by two outer shell electrons, but only a single high energy electron is ejected. 28 We have searched our data for evidence of such a process without success and estimate a provisional limit of 1% on its intensity relative to the main decay route of the DCH, which is sequential emission of two Auger electrons.…”

Slowing down of fast electrons as probe for charging and decharging dynamics of ion-irradiated insulators

“…Beams of highly charged C (23 and 40 MeV/u), O (23 MeV/u), Kr(64 MeV/u), Ag (40 MeV/u), and Xe (20, 23, and 30 MeV/u) ions were used to irradiate thin foils at the superconducting cyclotron of LNS, Catania and at GANIL, Caen. The multidetector ARGOS [1,[6][7][8] was mounted in the large scattering chamber CICLOPE or the CHIMERA chamber of LNS, or in the NAUTILUS chamber at GANIL. The velocity of fast electrons was measured by the time-of-flight (TOF) method with scintillation detectors.…”

“…Two distinct structures can be observed. BEEs appear at approximately twice the projectile velocity [1,[7][8][9][10]. They stem from a knockon ionization of target electrons by the projectile nucleus (scattering of a target electron in the projectile's Coulomb field).…”