Multielectron coincidence study of the double Auger decay of3d-ionized krypton

Abstract

This is the published version of a paper published in Physical Review A. Atomic, Molecular, and Optical Physics. Citation for the original published paper (version of record):Andersson, E., Fritzsche, S., Linusson, P., Hedin, L., Eland, J H. et al. (2010) Multielectron coincidence study of the double Auger decay of 3d-ionized krypton.Physical Review A. Atomic, Molecular, and Optical Physics, 82(4) Multielectron coincidence data for triple ionization of krypton have been recorded above the 3d ionization threshold at two photon energies (140 and 150 eV). Three principal transition pathways have been observed, two involving double Auger transitions from Kr + , and one involving single Auger transitions from Kr 2+ created by direct single-photon double ionization. The decay of the 3d 9 2 D 5/2,3/2 states in Kr + has been analyzed in some detail and is found to be strongly dominated by cascade processes where two electrons with well-defined energies are emitted. The decay paths leading to the 4s 2 4p 3 4 S, 2 D, and 2 P states of Kr 3+ are analyzed and energies of seven intermediate states in Kr 2+ are given. A preliminary investigation of the decay paths from Kr + 3d 9 4p 5 nl shake-up states has also been carried out.

Influence of double Auger decay on low-energy 3dphotoelectrons of krypton

“…For the first region the CDA decay occurs through the emission of a 14.7-eV Auger electron in the first step and a 0.73-eV Auger electron [25] in the second step (according to Ref. [24], the energy of the second Auger electron is 0.65 eV). In the second region the first-step Auger electron has an energy of 4.76 eV [25] (or 5.0 eV according to Ref.…”

“…Refs. [24,25]), we can select three different energy regions with strong intensities of the cascade Auger emission: 0.7-1.2, 4.5-5.5, and 7.0-7.5 eV. For the first region the CDA decay occurs through the emission of a 14.7-eV Auger electron in the first step and a 0.73-eV Auger electron [25] in the second step (according to Ref.…”

“…There are several reasons for carrying out such an investigation: First, PCI is expected to affect low-energy photoelectrons strongly, and the associated spectra cannot be analyzed without taking such influences into account. Second, recent studies on the DA decay of the Kr 3d vacancies [24,25] revealed different pathways for this process. In particular, the DA decay in the case of Kr 3d occurs mainly through a cascade double Auger (CDA) decay where the electrons are emitted stepwise through the creation and decay of an intermediate quasistationary state.…”

Complete double valence photoionization study of the electron spectra of krypton

“…In the autoionization spectrum of Fig. 3(a), this is manifested by a series of strong peaks (3,7,11,13,(15)(16)(17)(18) corresponding to ( 1 D)nd 2 S → 3 P 2 transitions. A copy of this series (peaks 1,5,6,8-10) can also be discerned for n = 8-13, which differs for each n in energy to the original very nearly by the 3 Fig.…”

“…At ionization energies above 65 eV, five moderately strong peak structures are observed. Most of the intensity likely appears because of spectral artifacts originating from the double Auger (DA) decay of the 3d core holes [16,17] ionized by second-and third-order synchrotron light. While a triple ionization event in reality, the DA electrons appear in the two-electron coincidence data when the photoelectron is not detected.…”