Auger line shift due to the post-collision interaction at large excess energies

Theoretical description of field-assisted postcollision interaction in Auger decay of atoms

“…III needs to be simplified in order to calculate E PCI . Following [23,24], we neglect the direct electron-electron interaction and model the PCI energy exchange by an instantaneous change in the ionic binding potential of X 2+ to X + for the Auger electron and X + to X 2+ for the photoelectron. The propagation scheme, sketched in Fig.…”

Evidence for Chirped Auger-Electron Emission

“…It appears as a consequence of the correlated motion of both photo-and Auger electrons in the Coulomb field of the remaining ion. While the underlying mechanism-also known as ''postcollision interaction'' (PCI)-has extensively been discussed in the literature [5][6][7][8][9][10], no attention has so far been paid to the consequence of the effect for the temporal properties of the escaping electron wave packets.In this Letter, we investigate this temporal energy variation in detail by using a terahertz-field-driven streak camera [11,12], where the ionization takes place in the presence of a strong oscillating electric field. We report significantly modified widths of kinetic energy spectra for opposite observation directions and field gradients which clearly indicate a chirp.…”

“…It appears as a consequence of the correlated motion of both photo-and Auger electrons in the Coulomb field of the remaining ion. While the underlying mechanism-also known as ''postcollision interaction'' (PCI)-has extensively been discussed in the literature [5][6][7][8][9][10], no attention has so far been paid to the consequence of the effect for the temporal properties of the escaping electron wave packets.…”

“…1: A fast Auger electron (AE) overtakes a slower photoelectron (PE) which causes a temporal change of the effective electronion interaction potential V ei the two electrons experience. As a consequence, after passing by the PE at a distance r à from the ion, the AE gains (the PE loses) the energy ÁE PCI ¼ À 1 r à À ðÀ 2 [8]. It is obvious-and will be derived analytically below-that the amount of energy exchange must depend on the relative timing between both electrons.…”

Time dependent aspects in the ionizations following atomic photoexcitations

“…We have, then, the so called post-collision interaction effect in the energy spectrum of emitted electrons or photoions [4,5]. The post-collision interaction effect is a time stamp placed on the energy spectra of emitted or scattered electrons [6][7][8]. We can, furthermore, observe the enhancement of the post-collision effects in the multiple-electron escape from the Auger cascade of the deep inner-shell photoionized atomic ions [9][10][11].…”