Electron correlation in Xe 4d Auger decay studied by slow photoelectron–Auger electron coincidence spectroscopy

Sheinerman, S.; Lablanquie, P.; Penent, F.; Palaudoux, J.; Eland, J. H. D.; Aoto, Tomohiro; Hikosaka, Y.; Ito, Kenji

doi:10.1088/0953-4075/39/5/002

Cited by 29 publications

(37 citation statements)

References 31 publications

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“…The change of the kinetic energy of the emitted particles is known as "post collision interaction" (PCI) [28]. So far, PCI has been studied in great detail after Auger decay [29]. As the Auger electron is emitted in the decay, the charge of the remaining ion changes.…”

mentioning

confidence: 99%

Evolution of Interatomic Coulombic Decay in the Time Domain

et al. 2013

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During the last 15 years a novel decay mechanism of excited atoms has been discovered and investigated. This so called "Interatomic Coulombic Decay" (ICD) involves the chemical environment of the electronically excited atom: the excitation energy is transferred (in many cases over long distances) to a neighbor of the initially excited particle usually ionizing that neighbor. It turned out that ICD is a very common decay route in nature as it occurs across van-der-Waals and hydrogen bonds. The time evolution of ICD is predicted to be highly complex, as its efficiency strongly depends on the distance of the atoms involved and this distance typically changes during the decay. Here we present the first direct measurement of the temporal evolution of ICD using a novel experimental approach.In 1997 Cederbaum and coworkers realized that the presence of loosely bound atomic or molecular neighbors opens a new relaxation pathway to an electronically excited atom or molecule. In the decay mechanism they proposed -termed Intermolecular Coulombic Decay (ICD) -the excited particle relaxes efficiently by transferring its excitation energy to a neighboring atom or molecule [1]. As a consequence the atom or molecule receiving the energy emits an electron of low kinetic energy. The occurrence of ICD was proven in experiments in the mid 2000s by means of electron spectroscopy [2] and multi-coincidence techniques [3]. Since that time a wealth of experimental and theoretical studies have shown that ICD is a rather common decay path in nature, as it occurs almost everywhere in loosely bound matter. It has been proven to occur after a manifold of initial excitation schemes such as innervalence shell ionization, after Auger cascades [4,5], resonant excitation [6,7], shakeup ionization [8] and resonant Auger decay. ICD has also been observed in many systems as rare gas clusters [9], even on surfaces [10] and small water droplets [11,12]. The latter suggested that ICD might play a role in radiation damage of living tissue [13], as it creates low energy electrons, which are known to be genotoxic [14,15]. More recently that scenario was reversed as it was suggested to employ ICD in treatment of tagged malignant cells [16]. Apart from these potential applications the elementary process of ICD is under investigation, as the decay is predicted to have a highly complex temporal * Electronic address: jahnke@atom.uni-frankfurt.de behavior. The efficiency and thus the decay times of ICD depend strongly on the size of the system, i.e. the number of neighboring particles and the distance between them and the excited particle. However, even for most simple possible model systems consisting of only two atoms the temporal evolution of the decay is non-trivial and predicted theoretically to exhibit exciting physics [17]: as ICD happens on a timescale that is fast compared to relaxation via photon emission, but comparable to the typical times of nuclear motion in the system, the dynamics of the decay is complicated and so far only theoretically explored...

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Evolution of Interatomic Coulombic Decay in the Time Domain

et al. 2013

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“…As the emission is from the same ionization process, investigating the phenomenon yields valuable information on the correlation of the two electrons. [86]. Although the earliest study was on bulk copper [75], the majority of the subsequent research has focused on gaseous samples.…”

Section: Electron Electron Coincidencementioning

confidence: 99%

“…By using coincidence methods, one can, for instance, determine the angular patterns of the photodouble ionization in atoms [85] and molecules [84], only possible to infer when the two correlated electrons are recorded at the same time. Further on, a great deal of insight into the mechanism of photo-double ionization of small molecules could be gained by employing the electron-electron coincidence technique, as shown by several authors [86][87] [88]. A special case of this technique is the so-called threshold photoelectron coincidence spectroscopy (in short, TPEsCO) [89][90] [91].…”

Section: Electron Electron Coincidencementioning

confidence: 99%

Coincidence spectroscopy: Past, present and perspectives

Arion

Hergenhahn

2015

Journal of Electron Spectroscopy and Related Phenomena

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Coincidence spectroscopy is a powerful spectroscopic method addressing the recording of more than one particle involved in an ionization process simultaneously. In the current manuscript, an overview of the available flavors of coincidence experiments is given, and new results on the Auger decay of CH 3 F are discussed. An outlook of possible future experiments employing the approach is also briefly discussed.

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“…At each photon energy, the theoretical curves have been normalized to the experimental ones on the maximum of the 3d 5/2 peak in the 1 S final state channel. Because HF calculations fail to reproduce the correct branching ratios (Sheinerman et al 2006) we have used the experimental values for this normalization. The normalization factor of the theoretical curves in the 1 D and 3 P channels is then obtained by correcting the calculated branching ratios which are approximately independent of the photon energy, R( 1 D : 1 S) = 1.35 and R( 3 P : 1 S) = 2.15, to the experimental ones which are respectively 1.59 and 1.27, as deduced from our measurement in the 3d 5/2 channel (Fig 7) .…”

Section: Comparison Of Calculated and Measured Spectramentioning

confidence: 99%

“…An important role of VMD has been revealed in the threshold electron spectra , Sheinerman et al 2006 and in the population of the highly excited Rydberg states (De Fanis et al 2004, Kitajima et al 2006.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of electron emission in double photoionization processes near the krypton 3d threshold

Penent

Sheinerman

Andrić

et al. 2008

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

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Abstract.Two electron emission following photoabsorption near the Kr 3d threshold is investigated both experimentally and theoretically. On the experimental side, electron / electron coincidences using a magnetic bottle time of flight spectrometer allow us to observe the complete Double Photo Ionisation (DPI) continua of selected Kr 2+ final states, and to see how these continua are affected by resonant processes in the vicinity of the Kr 3d threshold. The analysis is based on a quantum mechanical approach that takes into account the contribution of three different processes: A) Auger decay of the inner 3d vacancy with the associated post collision interaction (PCI) effects, B) capture of slow photoelectrons into discrete states followed by valence multiplet decay (VMD) of the excited ionic states and C) valence shell DPI. The dominant process for each Kr 2+ (4p −2 ) final state is the photoionization of the inner shell followed by Auger decay of the 3d vacancies. Moreover, for the 4p −2 ( 3 P ) and 4p −2 ( 1 D) final ionic states an important contribution comes from the processes of slow photoelectron capture followed by VMD as well as from double ionization of the outer shell involving also VMD.Confidential: not for distribution.

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Electron correlation in Xe 4d Auger decay studied by slow photoelectron–Auger electron coincidence spectroscopy

Cited by 29 publications

References 31 publications

Evolution of Interatomic Coulombic Decay in the Time Domain

Evolution of Interatomic Coulombic Decay in the Time Domain

Coincidence spectroscopy: Past, present and perspectives

Dynamics of electron emission in double photoionization processes near the krypton 3d threshold

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