Non-nearest neighbour ICD in clusters

Faßhauer, Elke

doi:10.1088/1367-2630/18/4/043028

Cited by 15 publications

(21 citation statements)

References 46 publications

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“…At the same time, a larger initial internuclear distance, i.e. ICD between non-nearest neighbors (second-shell ICD) [47], cannot explain the low fragment energies observed in the present experiment as such IC-decays would result in ICD electrons with much higher kinetic energy.…”

Section: Discussioncontrasting

confidence: 54%

Direct observation of interatomic Coulombic decay and subsequent ion-atom scattering in helium nanodroplets

et al. 2019

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We report on the experimental observation of Interatomic Coulombic Decay (ICD) in pure 4 He nanoclusters of mean sizes between N~5000-30000 and the subsequent scattering of energetic He + fragments inside the neutral cluster by using Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS). ICD is induced in He clusters by using VUV light of hν = 67 eV from the BESSY II synchrotron. The electronic decay creates two neighboring ions in the cluster at a well-defined distance. The measured fragment energies and angular correlations show that a main energy loss mechanism of these ions inside the cluster is a single hard binary collision with one atom of the cluster. † Electronic address: doerner@atom.uni-frankfurt.de

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Section: Discussioncontrasting

confidence: 54%

Direct observation of interatomic Coulombic decay and subsequent ion-atom scattering in helium nanodroplets

et al. 2019

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“…There, an energetic billiard-like collision takes place in which the He + ion transfers its KE to the He atom and thus stops moving if the collision is central (V). Subsequently, Coulomb explosion of the two He + ICD ions restarts from a larger distance as if ICD occured between non-nearest neighbors [25], giving rise to a lower final KE. This model is supported by a classical trajectory simulation for a linear configuration of atoms He-He + -He + -He.…”

Section: O N K I N E T I C E N E R G Y ( E V )mentioning

confidence: 99%

Interatomic Coulombic decay in helium nanodroplets

et al. 2017

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Interatomic Coulombic decay (ICD) is induced in helium (He) nanodroplets by photoexciting the n = 2 excited state of He + using XUV synchrotron radiation. By recording multiple coincidence electron and ion images we find that ICD occurs in various locations at the droplet surface, inside the surface region, or in the droplet interior. ICD at the surface gives rise to energetic He + ions as previously observed for free He dimers. ICD deeper inside leads to the ejection of slow He + ions due to Coulomb explosion delayed by elastic collisions with neighboring He atoms, and to the formation of He + k complexes.Isolated atoms or molecules excited by energetic radiation typically decay through intramolecular processes such as the emission of an electron or photon. In contrast, in weakly bound complexes, locally generated electrons can additionally interact with neighboring atoms or molecules, leading to new interatomic or intermolecular interactions. Interatomic Coulombic decay (ICD) is a particularly interesting decay process which occurs when local electronic decay is energetically forbidden [1]. Thus, ICD offers a new, ultrafast decay path where energy is exchanged with a neighboring atom leading to its ionization. Since its discovery, ICD has been observed in a wide variety of weakly-bound systems from He dimers [2,3] and rare-gas clusters to biologically relevant systems such as water clusters; for reviews see [4,5]. Today, the focus is on condensed-phase systems where ICD is involved in complex relaxation mechanisms [6][7][8], which can generate genotoxic low-energy electrons and radical cations [9]. Recently, it was suggested to utilize this property of ICD for cancer treatment [10,11].Here we present the first study of ICD in helium (He) nanodroplets. He nanodroplets are generally considered as an ultracold, inert spectroscopic matrix for embedded, isolated molecules and clusters [12,13]. Upon ionization by intense or energetic radiation, however, He droplets turn into a highly reactive medium, inducing reactions and secondary ionization processes of the embedded species [14]. Their homogeneous quantum liquid density profile, and the simple structure of atomic constituents, make He droplets particularly beneficial as benchmark systems for elucidating correlated decay processes. Recent examples include the collective autoionization of multiply excited pure He droplets [15,16] and the creation of doubly charged species by one-photon ionization of doped He droplets [17]. In this work we fully characterize the product states generated by ICD and secondary processes in He nanodroplets using coincidence imaging techniques.The experiments were performed using a He droplet machine attached to a velocity map imaging photoelectron-photoion coincidence (VMI-PEPICO) detector at the GasPhase beamline of Elettra-Sincrotrone Trieste, Italy. The apparatus has been described in detail elsewhere [18,19]. Briefly, a beam of He nanodroplets is produced by continuously expanding pressurized He (50 bar) of high purity He out of a c...

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“…Interparticle Coulombic Decay (ICD) [1,2] is an electronic decay process of ionized systems consisting of at least two weakly bonded units, be it atoms, molecules or clusters. ICD has been observed in multiple systems like noble gas clusters [3][4][5][6][7][8][9][10][11] and clusters of different solvent molecules like water [4,5,12] or ammonia [13][14][15][16]. It allowed to explain the repair mechanism of the enzyme photolyase [17] and was used to establish a more efficient double ionization strategy [18].…”

Section: Introductionmentioning

confidence: 99%

Time-resolved spectroscopy of interparticle Coulombic decay processes

Faßhauer

Madsen

2020

Phys. Rev. A

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We report theory for time-resolved spectator resonant Interparticle Coulombic Decay (ICD) processes. Following excitation by a short extreme ultraviolet pulse, the spectrum of the resonant ICD electron develops. Strong-field ionization is imagined to quench the decay at different time delays and to initiate regular ICD.In this latter process, the ICD electron signal can be measured without interference effects. The typical lifetimes of ICD processes allow for the observation of oscillations of the time-and energy-differential ionization probability. We propose to utilize this oscillation to measure lifetimes of electronic decay processes.

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Non-nearest neighbour ICD in clusters

Cited by 15 publications

References 46 publications

Direct observation of interatomic Coulombic decay and subsequent ion-atom scattering in helium nanodroplets

Direct observation of interatomic Coulombic decay and subsequent ion-atom scattering in helium nanodroplets

Interatomic Coulombic decay in helium nanodroplets

Time-resolved spectroscopy of interparticle Coulombic decay processes

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