Strong-Field Tunneling from a Coherent Superposition of Electronic States

Fechner, Lutz; Camus, Nicolas; Ullrich, J.; Pfeifer, Thomas; Moshammer, R.

doi:10.1103/physrevlett.112.213001

Cited by 48 publications

(44 citation statements)

References 33 publications

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“…This experiment demonstrates the capability to precisely measure electron angular distributions which is essential to investigate many different phenomena like quantum beating [35], electron correlation [36] or propensity rules [37].…”

Section: Angle-resolved Wavelength Scan: Xuv+ir In Heliummentioning

confidence: 99%

Atomic, Molecular and Cluster Science with the Reaction Microscope Endstation at FLASH2

et al. 2020

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The reaction microscope (REMI) endstation for atomic and molecular science at the free-electron laser FLASH2 at DESY in Hamburg is presented together with a brief overview of results recently obtained. The REMI allows coincident detection of electrons and ions that emerge from atomic or molecular fragmentation reactions in the focus of the extreme-ultraviolet (XUV) free-electron laser (FEL) beam. A large variety of target species ranging from atoms and molecules to small clusters can be injected with a supersonic gas-jet into the FEL focus. Their ionization and fragmentation dynamics can be studied either under single pulse conditions, or for double pulses as a function of their time delay by means of FEL-pump–FEL-probe schemes and also in combination with a femtosecond infrared (IR) laser. In a recent upgrade, the endstation was further extended by a light source based on high harmonic generation (HHG), which is now available for upcoming FEL/HHG pump–probe experiments.

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Section: Angle-resolved Wavelength Scan: Xuv+ir In Heliummentioning

confidence: 99%

Atomic, Molecular and Cluster Science with the Reaction Microscope Endstation at FLASH2

et al. 2020

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“…These dynamics can then be observed through measurement of the ionisation rate under a further ionisation step. Later works were able to observe these effects experimentally [17,18]. Here, our use of RMT theory allows the inclusion of a greater number of possible processes in the model, broadening the range of the physics we are able to study.…”

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confidence: 92%

Resolving Ultrafast Spin-Orbit Dynamics in Heavy Many-Electron Atoms

et al. 2019

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We use R-Matrix with Time-dependence (RMT) theory, with spin-orbit effects included, to study krypton irradiated by two time-delayed XUV ultrashort pulses. The first pulse excites the atom to 4s 2 4p 5 5s. The second pulse then excites 4s4p 6 5s autoionising levels, whose population can be observed through their subsequent decay. By varying the time delay between the two pulses, we are able to control the excitation pathway to the autoionising states. The use of cross-polarised light pulses allows us to isolate the two-photon pathway, with one photon taken from each pulse.

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“…Alternatively, still using the intrinsic coherence of strong-field laser-matter interaction, direct imaging of the electronic structure has been performed with tomographic reconstruction of molecular orbitals [42][43][44]. Even without recollision, strong-field ionization studies have proven a powerful probe of the electronic structure and properties of matter [9,45,46].…”

Section: Introductionmentioning

confidence: 99%

Signature of charge migration in modulations of double ionization

et al. 2018

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We present a theoretical investigation of charge migration following strong-field ionization in a multi-electron system. We study a model homo-nuclear molecule with two electrons, each restricted to one dimension (1+1D), interacting with a strong, static electric field. We show that in this system charge migration results from the interplay between multiple ionization channels that overlap in space, creating a coherent electron-hole wave packet in the cation. We also find that, in our case, charge migration following the first ionization manifests as a modulation of the subsequent double ionization signal. We derive a parametrized semiclassical model from the full multi-electron system and we discuss the importance of the choice of cation electronic-structure basis for the efficacy of the semiclassical representation. We use the ab-initio solution of the full 1+1D system as a reference for the qualitative and quantitative results of the parametrized semiclassical model. We discuss the extension of our model to long wavelength time-dependent fields with full dimension, many-electron targets.

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Strong-Field Tunneling from a Coherent Superposition of Electronic States

Cited by 48 publications

References 33 publications

Atomic, Molecular and Cluster Science with the Reaction Microscope Endstation at FLASH2

Atomic, Molecular and Cluster Science with the Reaction Microscope Endstation at FLASH2

Resolving Ultrafast Spin-Orbit Dynamics in Heavy Many-Electron Atoms

Signature of charge migration in modulations of double ionization

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