Attosecond time delay in valence photoionization and photorecombination of argon: A time-dependent local-density-approximation study

Magrakvelidze, Maia; Madjet, Mohamed; Dixit, Gopal; Ivanov, Misha; Chakraborty, Himadri

doi:10.1103/physreva.91.063415

Cited by 21 publications

(29 citation statements)

References 44 publications

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“…Due to the richness of many-body 3-attosecond TDLDA delay of the 4d emission relative to 5s which closely agrees with the relative delay of 18 attoseconds observed in streaking measurements [38]. (c) Published emission delays of C60 HOMO electron at the plasmon resonance [29] and Ar 3p electron near 3p CM [25], both in TDLDA, are shown for the comparison.…”

Section: Resultssupporting

confidence: 60%

“…Phase and Wigner-Smith delay calculations by us [25] using the time-dependent local-density approximation (TDLDA) have recently agreed very well with the experiment on argon 3p photorecombination around the 3p CM [16]. Correlated delays in the emission between atom-fullerene hybrid electrons near Cooper-type minima in the Ar@C 60 molecule were unraveled using TDLDA [22].…”

Section: Introductionmentioning

confidence: 70%

“…Over a wide range surrounding the 4d CM, TDLDA also predicts negative delays with a maximum of about −43 attoseconds at 185-eV photon energy. The result points to the considerable impact of the electron correlation via the interchannel coupling [25] of significantlyweakened 4d channel with other degenerate open channels around CM. The general shape of the 4d phase and delay in Figs.…”

Section: Resultsmentioning

confidence: 95%

“…Second, since the ionization strength significantly diminishes at the vicinity of a CM, correlations with other degenerate channels become conspicuous. As a result, CM regions may serve as strategic spectral windows to scrutinize the effects of correlations [25].…”

Section: Introductionmentioning

confidence: 99%

“…Several theoretical methods [4,5,[20][21][22][23][24][25] have been employed to explain experimental 3s − 3p relative delay [4,5] in argon with a diverse range of success. Phase and Wigner-Smith delay calculations by us [25] using the time-dependent local-density approximation (TDLDA) have recently agreed very well with the experiment on argon 3p photorecombination around the 3p CM [16].…”

Section: Introductionmentioning

confidence: 99%

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Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

2016

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A Kohn-Sham time-dependent local-density-functional scheme is utilized to predict attosecond time delays of xenon 4d photoionization that involves the 4d giant dipole resonance and Cooper minimum. The fundamental effect of electron correlations to uniquely determine the delay at both regions is demonstrated. In particular, for the giant dipole resonance, the delay underpins strong collective effect, emulating the recent prediction at C60 giant plasmon resonance [T. Barillot et al, Phys. Rev. A 91, 033413 (2015)]. For the Cooper minimum, a qualitative similarity with a photorecombination experiment near argon 3p minimum [S. B. Schoun et al., Phys. Rev. Lett. 112, 153001 (2014)] is found. The result should encourage attosecond measurements of Xe 4d photoemission.

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Section: Resultssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

2016

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First prediction of inter-Coulombic decay of C₆₀inner vacancies through the continuum of confined atoms

Magrakvelidze

Madjet

et al. 2016

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

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Considering the photoionization of Ar@C 60 and Kr@C 60 endofullerenes, the decay of C 60 innershell excitations through the outershell continuum of the confined atom via the inter-Coulombic decay (ICD) pathway is detailed. Excitations to atom-C 60 hybrid states demonstrate coherence between ICD and electron-transfer mediated decay (ETMD). This should be the dominant above-threshold decay process for a variety of confined systems, and the strength of these resonances is such that they should be amenable for study by photoelectron spectroscopy.PACS numbers: 33.80.Eh, 36.40.Cg First prediction of C 60 -to-confined-atom backward RICD

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Roadmap of ultrafast x-ray atomic and molecular physics

Young

Ueda

Gühr

et al. 2018

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

299

217

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X-ray free-electron lasers (XFELs) and table-top sources of x-rays based upon high harmonic generation (HHG) have revolutionized the field of ultrafast x-ray atomic and molecular physics, largely due to an explosive growth in capabilities in the past decade. XFELs now provide unprecedented intensity (10 20 W cm −2 ) of x-rays at wavelengths down to ∼1 Ångstrom, and HHG provides unprecedented time resolution (∼50 attoseconds) and a correspondingly large coherent bandwidth at longer wavelengths. For context, timescales can be referenced to the Bohr orbital period in hydrogen atom of 150 attoseconds and the hydrogen-molecule vibrational period of 8 femtoseconds; wavelength scales can be referenced to the chemically significant carbon K-edge at a photon energy of ∼280 eV (44 Ångstroms) and the bond length in methane of ∼1 Ångstrom. With these modern x-ray sources one now has the ability to focus on individual atoms, even when embedded in a complex molecule, and view electronic and nuclear motion on their intrinsic scales (attoseconds and Ångstroms). These sources have enabled coherent diffractive imaging, where one can image non-crystalline objects in three dimensions on ultrafast timescales, potentially with atomic resolution. The unprecedented intensity available with XFELs has opened new fields of multiphoton and nonlinear x-ray physics where behavior of matter under extreme conditions can be explored. The unprecedented time resolution and pulse synchronization provided by HHG sources has kindled fundamental investigations of time delays in photoionization, charge migration in molecules, and dynamics near conical intersections that are foundational to AMO physics and chemistry. This roadmap coincides with the year when three new XFEL facilities, operating at Ångstrom wavelengths, opened for users (European XFEL, Swiss-FEL and PAL-FEL in Korea) almost doubling the present worldwide number of XFELs, and documents the remarkable progress in HHG capabilities since its discovery roughly 30 years ago, showcasing experiments in AMO physics and other applications. Here we capture the perspectives of 17 leading groups and organize the contributions into four categories: ultrafast molecular dynamics, multidimensional x-ray spectroscopies; high-intensity x-ray phenomena; attosecond x-ray science.

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Attosecond time delay in valence photoionization and photorecombination of argon: A time-dependent local-density-approximation study

Cited by 21 publications

References 44 publications

Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

First prediction of inter-Coulombic decay of C₆₀inner vacancies through the continuum of confined atoms

Roadmap of ultrafast x-ray atomic and molecular physics

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Attosecond time delay in valence photoionization and photorecombination of argon: A time-dependent local-density-approximation study

Cited by 21 publications

References 44 publications

Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

First prediction of inter-Coulombic decay of C60inner vacancies through the continuum of confined atoms

Roadmap of ultrafast x-ray atomic and molecular physics

Contact Info

Product

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First prediction of inter-Coulombic decay of C₆₀inner vacancies through the continuum of confined atoms