Introducing many-body physics using atomic spectroscopy

Krebs, Dietrich; Pabst, Stefan; Santra, Robin

doi:10.1119/1.4827015

Cited by 26 publications

(55 citation statements)

References 78 publications

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“…The one-photon excitation cross section is calculated employing the autocorrelation-function technique described in Ref. [9]. For the calculation of the autocorrelation function a total propagation time of 5 × 10 4 a.u.…”

Section: Resultsmentioning

confidence: 99%

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Time-dependent configuration-interaction-singles calculation of the 5p -subshell two-photon ionization cross section in xenon

Karamatskou

Santra

2017

Phys. Rev. A

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The 5p two-photon ionization cross section of xenon in the photon-energy range below the one-photon ionization threshold is calculated within the time-dependent configuration-interaction-singles (TDCIS) method. The TDCIS calculations are compared to random-phase-approximation calculations [Wendin et al., J. Opt. Soc. Am. B 4, 833 (1987)] and are found to reproduce the energy positions of the intermediate Rydberg states reasonably well. The effect of interchannel coupling is also investigated and found to change the cross section of the 5p shell only slightly compared to the intrachannel case.

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Section: Resultsmentioning

confidence: 99%

“…The one-photon regime of the 4d-subshell ionization was also studied within the time-dependent configuration-interactionsingles (TDCIS) approach [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Time-dependent configuration-interaction-singles calculation of the 5p -subshell two-photon ionization cross section in xenon

Karamatskou

Santra

2017

Phys. Rev. A

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“…The restriction to the single excitation subspace inherent in TDCIS is, we believe, sufficiently quantitative for the purpose of the present paper. This assessment is based on earlier applications of the method that compared well with experimental results [10,[41][42][43], including experiments involving highly intense XUV fields [41] and strong optical fields [10,43]. Extending the TDCIS method to TDCISD by including double excitations is conceivable, but presently too demanding for applications in quantum control.…”

Section: Discussionmentioning

confidence: 99%

Maximizing hole coherence in ultrafast photoionization of argon with an optimization by sequential parametrization update

et al. 2016

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Photoionization with attosecond pulses populates hole states in the photoion. Superpositions of hole states represent ideal candidates for time-dependent spectroscopy, for example via pump-probe studies. The challenge consists in identifying pulses that create coherent superpositions of hole states while satisfying practical constraints. Here, we employ quantum optimal control to maximize the degree of coherence between these hole states. To this end, we introduce a derivative-free optimization method with sequential parametrization update (SPA optimization). We demonstrate the versatility and computational efficiency of SPA optimization for photoionization in argon by maximizing the coherence between the 3s and 3p 0 hole states using shaped attosecond pulses. We show that it is possible to maximize the hole coherence while simultaneously prescribing the ratio of the final hole state populations.

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“…One-photon absorption cross section of xenon calculated within TDCIS using the two models. The experimental curve [68] resembles the interchannel curve [69].…”

Section: B Xenon Ati Involving the Giant Dipole Resonancementioning

confidence: 99%

Nonlinear effects in photoionization over a broad photon-energy range within the TDCIS scheme

Karamatskou¹

2016

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

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The present tutorial provides an overview of the time-dependent configuration interaction singles (TDCIS) scheme applied to nonlinear ionization over a broad photon-energy range. The efficient propagation of the wave function and the calculation of photoelectron spectra within this approach are described and demonstrated in various applications. Above-threshold ionization of argon and xenon in the extreme ultraviolet energy range is investigated as an example. A particular focus is put on the xenon 4d giant dipole resonance and the information that nonlinear ionization can provide about resonance substructure. Furthermore, above-threshold ionization is studied in the x-ray regime and the intensity regime, at which multiphoton ionization starts to play a role at hard x-ray photon energies, is identified.

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Introducing many-body physics using atomic spectroscopy

Cited by 26 publications

References 78 publications

Time-dependent configuration-interaction-singles calculation of the 5p -subshell two-photon ionization cross section in xenon

Time-dependent configuration-interaction-singles calculation of the 5p -subshell two-photon ionization cross section in xenon

Maximizing hole coherence in ultrafast photoionization of argon with an optimization by sequential parametrization update

Nonlinear effects in photoionization over a broad photon-energy range within the TDCIS scheme

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