Core hole screening and decay rates of double core ionized first row hydrides

Inhester, Ludger; Groenhof, Gerrit; Grubmüller, Helmut

doi:10.1063/1.4801660

Cited by 14 publications

(6 citation statements)

References 34 publications

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“…They found that the nuclear motion of the K −2 state affects the Auger spectrum. Subsequently they computed the Auger decay rates of the K −2 states in a sequence of isoelectronic first-row hydrides, and showed that the rates of the double core-holes are more than twice those of the single core holes [57]. This rate enhancement for DCH was attributed partly to an increased valence population in the vicinity of the core-holes.…”

Section: History Of the Theoretical Study Of Molecular Dch Statesmentioning

confidence: 99%

Multi-electron coincidence spectroscopy: double photoionization from molecular inner-shell orbitals

Lablanquie¹,

Penent²,

Hikosaka³

2016

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

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The interest of molecular double core holes was predicted in 1986 by Cederbaum et al who showed that their spectroscopy can be more informative than that of the single core holes, especially when the holes are located at different sites in the molecule (Cederbaum et al J. Chem. Phys. 85 (1986) 6513). Their experimental study in single photon formation had to await 2009-2010 with progress in synchrotron sources and development of efficient multi-electron coincidence experiments based on a magnetic bottle time of flight spectrometer. At the same time the advent of X-rays Free Electron Lasers opened the possibilty to create them in a two-photon process, and motivated new theoretical studies of their properties. We will illustrate here with a few examples, the progress done recently in the field, including formation of double core holes by double core photoionization, their spectroscopy and decay paths, and the related process of simultaneous core ionization and core excitation.

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Section: History Of the Theoretical Study Of Molecular Dch Statesmentioning

confidence: 99%

Multi-electron coincidence spectroscopy: double photoionization from molecular inner-shell orbitals

Lablanquie¹,

Penent²,

Hikosaka³

2016

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

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“…[11], refers to double-core-hole (DCH) spectroscopy. Since the lifetimes of the DCH states can be significantly shorter than the lifetimes of the corresponding single-core-hole states (SCHs) [12][13][14][15], one can expect a considerable reduction of the nuclear dynamics in DCH states. However, as we have recently shown, strongly dissociative potential-energy surfaces of molecular DCH states may provide for a substantial nuclear dynamics [15] and may even lead to an ultrafast dissociation [16].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast nuclear dynamics in the doubly-core-ionized water molecule observed via Auger spectroscopy

et al. 2018

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We present a combined experimental and theoretical study of the Auger-emission spectrum following double core ionization and excitation of gas-phase water molecules with hard-x-ray synchrotron radiation above the O K −2 threshold. We observe an indication of ultrafast proton motion occurring within the 1.5 fs lifetime of the double-core-hole (DCH) states in water. Furthermore, we have identified symmetric and antisymmetric dissociation modes characteristic for particular DCH states. Our results serve as a fundamental reference for state-of-the-art studies of DCH dynamic processes in liquid water both at synchrotron and free-electron-laser facilities.

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“…´-2.2 10 3 . Furthermore, comparison of linewidths of the L-MM Auger and LL-MMM CAD signals showed that the double L-vacancy state decays more than two times faster compared to a single L-vacancy, similarly to double K-vacancy states [88,89]. From the full width at half maximum of the Lorentzian component in the Voigt profile fitted to the CAD spectral line, the decay rate of the LL D ( ) double vacancy state can be estimated as ´-5 10 s 14 1 , giving the CAD rate of the order of -10 s 12 1 .…”

Section: Experimental Evidence For Collective Auger Decay In Atomsmentioning

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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Core hole screening and decay rates of double core ionized first row hydrides

Cited by 14 publications

References 34 publications

Multi-electron coincidence spectroscopy: double photoionization from molecular inner-shell orbitals

Multi-electron coincidence spectroscopy: double photoionization from molecular inner-shell orbitals

Ultrafast nuclear dynamics in the doubly-core-ionized water molecule observed via Auger spectroscopy

Collective relaxation processes in atoms, molecules and clusters

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