Two-Electron-One-Photon Transitions in Heavy-Ion Collisions

Wölfli, W.; Stoller, Ch.; Bonani, Georges; Suter, M.; Stöckli, M. P.

doi:10.1103/physrevlett.35.656

Cited by 156 publications

(41 citation statements)

References 6 publications

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“…DCH atoms have been studied both theoretically and experimentally [1][2][3][4][5][6][7][8][9][10]. For molecules, however, only theoretical studies [11][12][13][14][15][16][17][18] have been available hitherto.…”

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confidence: 99%

Double Core Hole Creation and Subsequent Auger Decay inNH3andCH4Molecules

et al. 2010

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Energies of the hollow molecules CH 2þ 4 and NH 2þ 3 with double vacancies in the 1s shells have been measured using an efficient coincidence technique combined with synchrotron radiation. The energies of these states have been determined accurately by high level electronic structure calculations and can be well understood on the basis of a simple theoretical model. Their major decay pathway, successive Auger emissions, leads first to a new form of triply charged ion with a core hole and two valence vacancies; experimental evidence for such a state is presented with its theoretical interpretation. Preedge 2-hole-1-particle (2h-1p) states at energies below the double core-hole states are located in the same experiments and their decay pathways are also identified.

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confidence: 99%

Double Core Hole Creation and Subsequent Auger Decay inNH3andCH4Molecules

et al. 2010

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“…The theoretical prediction of TEOP transitions dates back to 1925 [15] but the first experimental evidence for this correlated twoelectron decay channel was reported only about 50 years later [16]. Actually, this first observation was done somewhat accidentally while analyzing a HI-induced K X-ray spectrum, in which a very weak X-ray line having the same energy as the one of the TEOP transition was found.…”

Section: Introductionmentioning

confidence: 98%

Photoinduced K-shell hollow atoms

Hoszowska

Dousse

2013

Journal of Electron Spectroscopy and Related Phenomena

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The mechanisms leading to the production of hollow K shell atoms via single photon impact were investigated for a variety of light elements with 12 ≤ Z ≤ 23. The double 1s vacancy states were produced by irradiating the samples with intense monoenergetic synchrotron radiation beams. The double-to-single K-shell photoionization probabilities P KK and the absolute double K-shell photoionization cross sections 2+ were determined by measuring with a high-resolution bent von Hamos crystal spectrometer the K˛h hypersatellite X-ray emission of the samples. The measurements were performed over a wide range of incoming photon energies from threshold up to energies beyond the broad maximum of the double-tosingle photoionization cross section ratios. The P KK and 2+ were determined from the relative yields of the resolved K˛h hypersatellite lines. For Mg, Al and Si, the two-electron one-photon (TEOP) K˛˛h transitions which represent an alternative but much weaker decay channel for double 1s vacancy states could be also observed, using a highly efficient flat crystal wavelength dispersive spectrometer. This observation of single photon-induced TEOP transitions has shown that the I(K˛h)/I(K˛˛h) branching ratios are very poorly reproduced by most of existing theoretical models. Besides the relative yields of the hypersatellite and TEOP transitions, the energies and natural linewidths of the K˛h and K˛˛h X-ray lines were also determined. The energies are found to be in good agreement with different theoretical predictions, whereas the linewidths are significantly underestimated by the calculations, except if non-lifetime broadening effects such as the outer-shell ionization and the open valence configuration are taken into consideration.

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“…§ An analogous radiative process, in which a double vacancy is filled by two electrons and a single photon is emitted is also known [8,9]. CAD was probably first observed in 1975 by Afrosimov et al [10] in collisions of various ions with Ar atoms.…”

Section: Introductionmentioning

confidence: 99%

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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Two-Electron-One-Photon Transitions in Heavy-Ion Collisions

Cited by 156 publications

References 6 publications

Double Core Hole Creation and Subsequent Auger Decay inNH3andCH4Molecules

Double Core Hole Creation and Subsequent Auger Decay inNH3andCH4Molecules

Photoinduced K-shell hollow atoms

Collective relaxation processes in atoms, molecules and clusters

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