Multielectron spectroscopy: Auger decays of the argon 2p hole

Lablanquie, P.; Andrić, L.; Palaudoux, J.; Becker, Uwe; Braune, Markus; Viefhaus, Jens; Eland, J. H. D.; Penent, F.

doi:10.1016/j.elspec.2006.11.062

Cited by 77 publications

(70 citation statements)

References 34 publications

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“…One of today's most powerful multielectron coincidence techniques is based on a magnetic bottle for the measurement of electron flight times [5], as recently introduced by Eland et al [6] and implemented at synchrotron radiation sources for inner-shell studies by Penent et al [7]. The magnetic bottle technique makes it possible to obtain detailed information on the photoionized states as well as various decay paths as has been demonstrated by Penent et al [7] for the Xe 4d case and by Lablanquie et al for the Ar 2p case [8]. A major strength of coincidence experiments is the possibility to project specific signals from the multidimensional data sets, where signals from competing processes may overlap with each other and hide features of interest, as we shall demonstrate in this work.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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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.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2010

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“…Electron Detection. The magnetic bottle spectrometer we have employed uses an adaptation of the design by Lablanquie et al 30 to experiments with the bunch period of BESSY II, which is 800 ns. We have therefore shortened the drift tube to 60 cm.…”

Section: Nphys-2009-06-00979amentioning

confidence: 99%

A hitherto unrecognized source of low-energy electrons in water

et al. 2010

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Because ICD is expected to take place universally in weakly bound aggregates containing light atoms between carbon and neon in the periodic table 2,3 , these results could have implications for our understanding of ionization damage in living tissues. NPHYS-2009-06-00979a 2 Electronic vacancy states can be produced in matter by ionizing radiation, such as X-ray photons or fast charged particles. When a state with a high electronic excitation energy has been produced by impact of such particles, electron correlation can cause the ejection of electrons. Auger decay is the best known representative of this class of secondary processes that is more generally termed autoionization. In other words, the mechanism is a concerted transition in which a single hole in an inner shell is replaced by two vacancies in the outer valence shells of two adjacent molecules, and a free electron. This decay channel was termed Intermolecular (Interatomic, in the case of atomic clusters) Coulombic Decay and was subsequently observed in rare gas clusters 4-7 .The process is shown schematically in Fig. 1. A resonant variant of ICD, which may take place after photoexcitation into an unoccupied orbital, has also been discussed [7][8][9] . In the present paper, we consider ICD of inner valence vacancy states, for which case the ejected electrons have a low kinetic energy.On the basis of energetic considerations, ICD can take place whenever the binding energy of the ionized state lies above the double ionization threshold of the corresponding cluster or liquid. This prerequisite for ICD is fulfilled in hydrogen-bonded systems 2,10 , but so far the process has not been seen. Calculations of the energy spectrum of electrons ejected by ICD of small water clusters give a hint as to why it has escaped observation: A broad, rather unstructured distribution of energies is expected, which peaks at zero eV 10 . Ifwe consider an experiment with a conventional electron energy analyser on a bulk or liquid NPHYS-2009-06-00979a 3 sample, an electron spectrum with this shape can hardly be distinguished from the "universal curve" 1 for secondary electrons (Fig. 2). In this respect our work differs from earlier experiments, which were either restricted to dimers 5-7 , or dealt with simpler cases where an ICD feature appears from simple electron kinetic energy spectra 4,8,9 . Producing primary electrons of a well-defined energy by photoionization and detecting them in coincidence with the ICD electron has allowed us to overcome the aforementioned problem. Here, we demonstrate that ICD follows the photoionization of medium-sized water clusters and show that -above the corresponding photoionization threshold -ICD electrons make an important contribution to the low kinetic energy spectrum.In our experiment, a jet of water clusters with a mean size 〈N〉 of 40 or 200 was used.Such clusters are believed to form amorphous structures, which resemble the hydrogenbonded network of liquid water rather than that of crystalline ice 11 . Inner valence vacancies were p...

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“…In double Auger, by contrast, the two Auger electrons share the available excess energy, dividing it between them with a distribution, which is in principle unknown. Recent coincidence studies of the double Auger effect in atoms [2][3][4][5] have shown that both "direct" and "cascade" pathways exist, giving continuous and discrete electron distributions, respectively. Cascade pathways involve the formation of intermediate doubly ionized states with quantized energies and measurable widths ͑lifetimes͒.…”

Section: Introductionmentioning

confidence: 99%

Triple ionization spectra by coincidence measurements of double Auger decay: The case of OCS

Eland¹,

Hochlaf²,

Linusson³

et al. 2010

The Journal of Chemical Physics

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Triple ionization spectra by coincidence measurements of double Auger decay: The case of OCS. By combining multiple electron coincidence detection with ionization by synchrotron radiation, we have obtained resolved spectra of the OCS 3+ ion created through the double Auger effect. The form of the spectra depends critically on the identity of the atom bearing the initial hole. High and intermediate level electron structure calculations lead to an assignment of the resolved spectrum from ionization via the S 2p hole. From the analysis it appears that the double Auger effect from closed shell molecules favors formation of doublet states over quartet states. Molecular field effects in the double Auger effect are similar to those in the single Auger effect in linear molecules. Journal of Chemical Physics

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Multielectron spectroscopy: Auger decays of the argon 2p hole

Cited by 77 publications

References 34 publications

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

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

A hitherto unrecognized source of low-energy electrons in water

Triple ionization spectra by coincidence measurements of double Auger decay: The case of OCS

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