Direct observation of three-electron collective decay in a resonant Auger process

Eland, J. H. D.; Squibb, Richard J.; Mucke, Melanie; Zagorodskikh, Sergey; Linusson, P.; Feifel, Raimund

doi:10.1088/1367-2630/17/12/122001

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…According to the authors, the interpretation could ideally be corroborated by a coincidence measurement. Such an experiment was carried out recently by Eland et al [91] and indeed confirmed the three-electron character of the second step of the decay cascade initiated by  3d 5p excitation of Kr. The experiment combined energy-selected synchrotron light with a magnetic bottle time-of-flight spectrometer, which enabled the detection of the photoelectron, the resonant Auger electron and the CAD electron in coincidence.…”

Section: Experimental Evidence For Collective Auger Decay In Atomssupporting

confidence: 59%

“…The measurement of CAD after resonant Auger decay in Kr [85] discussed in a previous section indicates that a lower energy of the emitted electron can lead to a significant increase in the efficiency of the collective decay. This result is in full accordance with the calculations.…”

Section: Theory Of Cadmentioning

confidence: 94%

“…The experimental setup was similar to that used to study CAD in Kr atom [85], i.e. energy-selected synchrotron light from the storage ring BESSY II was combined with a magnetic bottle time-of-flight electron spectrometer.…”

Section: Collective Decay In Moleculesmentioning

confidence: 99%

“…The CAD rate increases also if the energy of the emitted electron is low. This is exemplified by the decay cascade from resonantly excited Kr [12,91], in which the CAD electron emitted in the second step carries energy only about 20-25 eV.…”

mentioning

confidence: 99%

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Collective relaxation processes in atoms, molecules and clusters

Kolorenč

Averbukh

Feifel

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Electron correlation is an essential driver of a variety of relaxation processes in excited atomic and molecular systems. These are phenomena which often lead to autoionization typically involving two-electron transitions, such as the well-known Auger effect. However, electron correlation can give rise also to higherorder processes characterized by multi-electron transitions. Basic examples include simultaneous two-electron emission upon recombination of an inner-shell vacancy (double Auger decay) or collective decay of two holes with emission of a single electron. First reports of this class of processes date back to the 1960's, but their investigation intensified only recently with the advent of free-electron lasers. High fluxes of high-energy photons induce multiple excitation or ionization of a system on the femtosecond timescale and under such conditions the importance of multielectron processes increases significantly. We present an overview of experimental and theoretical works on selected multi-electron relaxation phenomena in systems of different complexity, going from double Auger decay in atoms and small molecules to collective interatomic autoionization processes in nanoscale samples.

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Section: Experimental Evidence For Collective Auger Decay In Atomssupporting

confidence: 59%

Section: Theory Of Cadmentioning

confidence: 94%

Section: Collective Decay In Moleculesmentioning

confidence: 99%

mentioning

confidence: 99%

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Collective relaxation processes in atoms, molecules and clusters

Kolorenč

Averbukh

Feifel

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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“…In the coincidence experiment carried out by Eland et al 56 , the three-electron process was found to be about 40 times weaker than the competing two-electron process, corresponding to branching ratio of 2.4%. As such, decay of the Kr + (3d 10 4s 0 4p 6 5p) state is perfect case to test the new Fano-ADC(2,2) method.…”

Section: Collective Three-electron Auger Decaymentioning

confidence: 86%

Fano-ADC(2,2) method for electronic decay rates

Kolorenč,

Averbukh

2020

Preprint

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Fano-ADC is a family of ab initio methods for prediction of electronic decay widths in excited, singly-and doubly-ionized systems. It has been particularly successful in elucidating the geometry dependence of the inter-atomic decay widths in clusters and facilitated prediction of new electronic decay phenomena. However, the available Fano-ADC schemes are limited to the second order treatment of the initial state and fist-order treatment of the final states of the decay. This confines the applicability of the Fano-ADC approach to first-order decay processes, e.g. normal but not double Auger decay, and compromises the numerical accuracy of the schemes through the unbalanced treatment of electronic correlation. Here we introduce the ADC(2,2) approximation for singly ionized states which describes both initial and final states of the decay up to second order. We use the new scheme to construct the Fano-ADC(2,2) approximation for the decay widths and show that it provides superior accuracy for the decay widths of a series of processes. Moreover, the Fano-ADC(2,2) method provides access to second-order decay processed, such as double Auger decay, which are qualitatively beyond reach of the previously available Fano-ADC implementations.

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