Multiple ionization of neon under soft x-rays: theory versus experiment

Nikolopoulos, Georgios M.; Lambropoulos, P.

doi:10.1088/0953-4075/47/11/115001

Cited by 8 publications

(14 citation statements)

References 23 publications

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“…As LOPT has shown itself to be in excellent agreement with experiment [8][9][10][11], we deduce that our TDDFT results have a tendency to slightly underestimate the total ionic yield. It must be added, however, that these differences are minor and are likely to fall within the present experimental accuracy of many FEL experiments.…”

Section: A Ne Atomsupporting

confidence: 83%

“…The total ionization yield can be reconstructed by computing a weighted sum over the different ionization channels. From LOPT we directly obtain all the individual ionic yields P q+ [10,11] and the total yield can be obtained with the same prescription. Within TDDFT, we can directly obtain the total yield either by summing up the individual ionization channels or by monitoring the total charge.…”

Section: Total and Individual Yieldsmentioning

confidence: 99%

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Time-dependent density-functional theory of strong-field ionization of atoms by soft x rays

et al. 2014

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We demonstrate the capabilities of time-dependent density functional theory (TDDFT) for strong-field, short wavelength (soft X-ray) physics, as compared to a formalism based on rate equations. We find that TDDFT provides a very good description of the total and individual ionization yields for Ne and Ar atoms exposed to strong laser pulses. We assess the reliability of different adiabatic density functionals and conclude that an accurate description of long-range interactions by the exchange and correlation potential is crucial for obtaining the correct ionization yield over a wide range of intensities (10 13 -5×10 15 W/cm 2 ). Our TDDFT calculations disentangle the contribution from each ionization channel based on the Kohn-Sham wavefunctions.

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Section: A Ne Atomsupporting

confidence: 83%

Section: Total and Individual Yieldsmentioning

confidence: 99%

Time-dependent density-functional theory of strong-field ionization of atoms by soft x rays

et al. 2014

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“…The cross sections used in the numerical calculations are justified by the values deduced from the relevant saturation intensities (I SAT ) of the present paper (typical cross sections can be found in Refs. [35,36]). The measured Ar 2+ signal after an increase with slope s ≈ 1.8 ± 0.3 saturates at I SAT ≈ 2.2 × 10 15 W cm −2 where s drops to ≈ 1.3 ± 0.1.…”

Section: Mutiple Ionization Of Argonmentioning

confidence: 99%

“…We do so as follows. First, for a certain peak intensity we used the following equation [36] to determine the intensity, I XUV , at each point (r, z) in cylindrical coordinates:…”

Section: Numerical Calculationsmentioning

confidence: 99%

Multiple ionization of argon via multi-XUV-photon absorption induced by 20-GW high-order harmonic laser pulses

et al. 2018

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We report the observation of multiple ionization of argon through multi-XUV-photon absorption induced by an unprecedentedly powerful laser driven high-order harmonic generation source. Comparing the measured intensity dependence of the yield of the different argon charge states with numerical calculations we can infer the different channels-direct and sequential-underlying the interaction. While such studies were feasible so far only with free electron laser (FEL) sources, this paper connects highly nonlinear XUV processes with the ultrashort time scales inherent to the harmonic pulses and highlights the advanced perspectives of emerging large scale laser research infrastructures.

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“…Given that we needed many single-photon cross sections, for several ionic species each with a different structure, for reasons of selfconsistency it was desirable to employ a method applicable to all. Cowan's code, which has been found quite adequate in such a context [31], offers the necessary flexibility for the task. The two-photon cross sections σ (2) 76 and σ (2) 87 were calculated with the single-channel quantum defect theory.…”

Section: Appendixmentioning

confidence: 99%

Two-electron processes in multiple ionization under strong soft-x-ray radiation

et al. 2016

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In a combined experimental and theoretical study we have investigated the ionization of atomic argon upon irradiation with intense soft-x-ray pulses of 105 eV photon energy from the free-electron laser FLASH. The measured ion yields show charge states up to Ar 7+ . The comparison with the theoretical study of the underlying photoionization dynamics highlights the importance of excited states in general and of processes governed by electron correlation in particular, namely, ionization with excitation and shake-off, processes usually inaccessible by measurements of ionic yields only. The Ar 7+ yield shows a clear deviation from the predictions of the commonly used model of sequential ionization via single-electron processes and the observed signal can only be explained by taking into account the full multiplet structure of the involved configurations and by inclusion of two-electron processes. The competing process of two-photon ionization from the ground state of Ar 6+ is calculated to be orders of magnitude smaller.

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Multiple ionization of neon under soft x-rays: theory versus experiment

Cited by 8 publications

References 23 publications

Time-dependent density-functional theory of strong-field ionization of atoms by soft x rays

Time-dependent density-functional theory of strong-field ionization of atoms by soft x rays

Multiple ionization of argon via multi-XUV-photon absorption induced by 20-GW high-order harmonic laser pulses

Two-electron processes in multiple ionization under strong soft-x-ray radiation

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