EUV-photon-induced multiple ionization and fragmentation dynamics: from atoms to molecules

Jiang, Yuhai; Rudenko, Artem; Курка, М.; Kühnel, K. U.; Foucar, L.; Ergler, Th.; Lüdemann, Susanna K.; Zrost, K.; Ferger, T.; Fischer, Daniel; Dorn, Alexander; Titze, J.; Jahnke, T.; Schöffler, M. S.; Schößler, S.; Havermeier, T.; Smolarski, Mathias; Cole, Kathryn; Dørner, R.; Zouros, T. J. M.; Düsterer, S.; Treusch, R.; Gensch, Michael; Schröter, C. D.; Moshammer, R.; Ullrich, J.

doi:10.1088/0953-4075/42/13/134012

Cited by 18 publications

(20 citation statements)

References 51 publications

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“…Of course KER spectra cannot be predicted by rate equations alone, the nuclear degrees of freedom need to be considered. Experiments in the EUV on N 2 and O 2 [11][12][13] addressed the origin of different structures in the KER spectra for singly charged ions. For O 2 in [11] the number of photons absorbed was determined, and a suggestion was made for a set of electronic states involved based on the variation of the spectrum when increasing the intensity and by comparing with coincidence measurements.…”

Section: Introductionmentioning

confidence: 99%

Dissociative multiple ionization of diatomic molecules by extreme-ultraviolet free-electron-laser pulses

Leth

Madsen

2011

Phys. Rev. A

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Nuclear dynamics in dissociative multiple ionization processes of diatomic molecules exposed to extremeultraviolet free-electron-laser pulses is studied theoretically using the Monte Carlo wave packet approach. By simulated detection of the emitted electrons, the model reduces a full propagation of the system to propagations of the nuclear wave packet in one specific electronic charge state at a time. Suggested ionization channels can be examined, and kinetic energy release spectra for the nuclei can be calculated and compared with experiments. Double ionization of O 2 is studied as an example, and good agreement with published experimental data is obtained by simulating the dynamics on ten different electronic Born-Oppenheimer curves.

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Section: Introductionmentioning

confidence: 99%

Dissociative multiple ionization of diatomic molecules by extreme-ultraviolet free-electron-laser pulses

Leth

Madsen

2011

Phys. Rev. A

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“…In particular, total ionization cross sections [33,34], time-of-flight spectra [42] , as well as energy and angular distributions [44][45][46] ion yield originating from single-photon ionization, which manifests a slope of 1 in a doublelogarithmic representation (see [38,44,45]). …”

Section: Multiple Fragmentation Of N 2 Moleculementioning

confidence: 99%

“…10). The need for two photons to be absorbed is most likely due to exceedingly small cross sections close to the single-photon double ionization threshold, while sequential twophoton double ionization involving, e.g., excited states of N 2 + is expected to be relatively large [44]. Second, the asymmetric dissociative dication channel (N 2 2+ N 2+ +N) is dominated by three-photon absorption even though only two photons would be needed.…”

Section: Multiple Fragmentation Of N 2 Moleculementioning

confidence: 99%

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Rudenko

Jiang

Курка

et al. 2010

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

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Abstract:In this contribution we briefly review a series of recent pioneering experiments on fewphoton-induced multiple fragmentation of atoms and molecules performed at the Free electron LASer at Hamburg (FLASH) using a "Reaction Microscope", i.e., a coincident momentum imaging technique. For atoms we consider the most basic non-linear process, namely direct or sequential two-photon double ionization (TPDI). In particular benchmark data for theory are presented such as recoil-ion momentum distributions for direct TPDI of He and Ne, and fully differential data for sequential TPDI of Ne. For molecules we show how one can identify contributions from different reaction channels by inspecting the measured kinetic energy and angular distributions of ionic fragments, and even infer the time-delay between the two photon absorption events in TPDI by detailed comparison with theory.Finally, we describe a novel split mirror arrangement for EUV-pump -EUV-probe experiments, and present the very first time-resolved data on the dynamics of N 2 molecules irradiated by the FLASH light.

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“…For a linearly polara) Electronic mail: larsson [at] caltech.eδu; Present address: Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA ized field, are they accelerated to the same or to opposite directions? 2,[11][12][13][14][15][16][17][18][19][20][21] The motion into the same direction is called front-to-back or correlated motion whereas the motion into opposite directions is called back-to-back or anti-correlated motion. 2,11,13,[22][23][24] The external field couples directly only to the front-to-back motion.…”

Section: Introductionmentioning

confidence: 99%

Control of concerted back-to-back double ionization dynamics in helium

Larsson

Tannor

2021

The Journal of Chemical Physics

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Double ionization (DI) is a fundamental process that despite its apparent simplicity provides rich opportunities for probing and controlling the electronic motion. Even for the simplest multielectron atom, helium, new DI mechanisms are still being found. To first order in the field strength, a strong, external field doubly-ionizes the electrons in helium such that they are ejected into the same direction (front-to-back motion). The ejection into opposite directions (back-to-back motion) cannot be described to first order, making it a challenging target for control. Here, we address this challenge and optimize the field with the objective of back-toback double ionization, using a (1+1)-dimensional model. The optimization is performed using four different control procedures: (1) short-time control, (2) derivative-free optimization of basis expansions of the field, (3) the Krotov method and (4) control of the classical equations of motion. All four procedures lead to fields with dominant back-to-back motion. All the fields obtained exploit essentially the same two-step mechanism leading to back-to-back motion: first, the electrons are displaced by the field into the same direction. Second, after the field turns off, the nuclear attraction and the electron-electron repulsion combine to generate the final motion into opposite directions for each electron. By performing quasi-classical calculations, we confirm that this mechanism is essentially classical.

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EUV-photon-induced multiple ionization and fragmentation dynamics: from atoms to molecules

Cited by 18 publications

References 51 publications

Dissociative multiple ionization of diatomic molecules by extreme-ultraviolet free-electron-laser pulses

Dissociative multiple ionization of diatomic molecules by extreme-ultraviolet free-electron-laser pulses

Exploring few-photon, few-electron reactions at FLASH: from ion yield and momentum measurements to time-resolved and kinematically complete experiments

Control of concerted back-to-back double ionization dynamics in helium

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