Unusual under-threshold ionization of neon clusters studied by ion spectroscopy

Nagaya, K.; Sugishima, A.; Iwayama, H.; Murakami, Hitoshi; Yao, Makoto; Fukuzawa, H.; Xj, Liu; Motomura, K.; Ueda, Kiyoshi; Saitô, Norio; Foucar, L.; Rudenko, Artem; Курка, М.; Kühnel, K. U.; Ullrich, J.; Czasch, A.; Dørner, R.; Feifel, Raimund; Nagasono, Mitsuru; Higashiya, A.; Yabashi, Makina; Ishikawa, Tetsuya; Togashi, Tadashi; Kimura, Hiroaki; Ohashi, Haruhiko

doi:10.1088/0953-4075/46/16/164023

Cited by 17 publications

(11 citation statements)

References 30 publications

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“…An example for a practical application is the characterization of heterogeneous structures and interfaces using spectral signatures attributed to ICD1516. The high density of atomic excited states populated within a single cluster also results in collective autoionization processes in which several excited atoms are involved as predicted theoretically17 and observed experimentally at a free electron laser (FEL)181920.…”

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confidence: 99%

Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser

Oelze

Schütte

Müller

et al. 2017

Sci Rep

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Irradiation of nanoscale clusters and large molecules with intense laser pulses transforms them into highly-excited non- equilibrium states. The dynamics of intense laser-cluster interaction is encoded in electron kinetic energy spectra, which contain signatures of direct photoelectron emission as well as emission of thermalized nanoplasma electrons. In this work we report on a so far not observed spectrally narrow bound state signature in the electron kinetic energy spectra from mixed Xe core - Ar shell clusters ionized by intense extreme-ultraviolet (XUV) pulses from a free-electron-laser. This signature is attributed to the correlated electronic decay (CED) process, in which an excited atom relaxes and the excess energy is used to ionize the same or another excited atom or a nanoplasma electron. By applying the terahertz field streaking principle we demonstrate that CED-electrons are emitted at least a few picoseconds after the ionizing XUV pulse has ended. Following the recent finding of CED in clusters ionized by intense near-infrared laser pulses, our observation of CED in the XUV range suggests that this process is of general relevance for the relaxation dynamics in laser produced nanoplasmas.

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mentioning

confidence: 99%

Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser

Oelze

Schütte

Müller

et al. 2017

Sci Rep

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“…Stimulated by the work of Kuleff et al [26] and following the measurement of ionic fragmentation upon 2p → 3d multiple excitation (20.26 eV) of Ne clusters [30], Yase et al [31] investigated the EUVFEL-induced electron emission from Ne clusters at SCSS (SPring-8 Compact SASE Source test accelerator, Japan) [28]. However, in the FEL intensity range they used (≥ 3×10 13 W/cm 2 ), no ICD processes could be identified.…”

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confidence: 99%

Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters

Iablonskyi¹,

Nagaya²,

Fukuzawa³

et al. 2016

Phys. Rev. Lett.

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Ne clusters (∼5000 atoms) were resonantly excited (2p→3s) by intense free electron laser (FEL) radiation at FERMI. Such multiply excited clusters can decay nonradiatively via energy exchange between at least two neighboring excited atoms. Benefiting from the precise tunability and narrow bandwidth of seeded FEL radiation, specific sites of the Ne clusters were probed. We found that the relaxation of cluster surface atoms proceeds via a sequence of interatomic or intermolecular Coulombic decay (ICD) processes while ICD of bulk atoms is additionally affected by the surrounding excited medium via inelastic electron scattering. For both cases, cluster excitations relax to atomic states prior to ICD, showing that this kind of ICD is rather slow (picosecond range). Controlling the average number of excitations per cluster via the FEL intensity allows a coarse tuning of the ICD rate.

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“…The observed decay channel emerges when these excited atoms relax to their ground state and donate the available energy to a second nearby electron (either quasifree, or itself weakly bound to an atomic core) that can escape the cluster potential. In this respect our mechanism includes the process of interatomic Coulombic decay (ICD) 11 12 13 and more specifically one of its variants involving excited states as discussed in refs 14 , 15 , 16 , 17 , 18 , 19 . As the process takes place in a highly dynamic environment, that is during cluster expansion, collisions of excited atoms may play a role.…”

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Observation of correlated electronic decay in expanding clusters triggered by near-infrared fields

et al. 2015

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When an excited atom is embedded into an environment, novel relaxation pathways can emerge that are absent for isolated atoms. A well-known example is interatomic Coulombic decay, where an excited atom relaxes by transferring its excess energy to another atom in the environment, leading to its ionization. Such processes have been observed in clusters ionized by extreme-ultraviolet and X-ray lasers. Here, we report on a correlated electronic decay process that occurs following nanoplasma formation and Rydberg atom generation in the ionization of clusters by intense, non-resonant infrared laser fields. Relaxation of the Rydberg states and transfer of the available electronic energy to adjacent electrons in Rydberg states or quasifree electrons in the expanding nanoplasma leaves a distinct signature in the electron kinetic energy spectrum. These so far unobserved electron-correlation-driven energy transfer processes may play a significant role in the response of any nano-scale system to intense laser light.

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Unusual under-threshold ionization of neon clusters studied by ion spectroscopy

Cited by 17 publications

References 30 publications

Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser

Correlated electronic decay in expanding clusters triggered by intense XUV pulses from a Free-Electron-Laser

Slow Interatomic Coulombic Decay of Multiply Excited Neon Clusters

Observation of correlated electronic decay in expanding clusters triggered by near-infrared fields

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