Modulation of Attosecond Beating in Resonant Two-Photon Ionization

Jiménez-Galán, Álvaro; Argenti, Luca; Martín, Fernando

doi:10.1103/physrevlett.113.263001

Cited by 72 publications

(93 citation statements)

References 53 publications

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“…Here, we solve the TDSE with a second-order exponential time-step propagator in velocity gauge [34,35]. Reflection from the box boundaries is prevented by complex absorbing potentials.…”

Section: Computation Of the Atas Spectrummentioning

confidence: 99%

Dressing effects in the attosecond transient absorption spectra of doubly excited states in helium

et al. 2015

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Strong-field manipulation of autoionizing states is a crucial aspect of electronic quantum control. Recent measurements of the attosecond transient absorption spectrum (ATAS) of helium dressed by a few-cycle visible pulse [C. Ott et al., Nature (London) 516, 374 (2014)] provide evidence of the inversion of Fano profiles. With the support of accurate ab initio calculations that reproduce the results of the latter experiment, here we investigate the new physics that arise from ATAS when the laser intensity is increased. In particular, we show that (i) previously unnoticed signatures of the dark 2p 2 1 S doubly excited state are observed in the experimental spectrum, (ii) inversion of Fano profiles is predicted to be periodic in the laser intensity, and (iii) the ac Stark shift of the higher terms in the sp + 2,n autoionizing series exceeds the ponderomotive energy, which is the result of a genuine two-electron contribution to the polarization of the excited atom.

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“…Here, we solve the TDSE with a second-order exponential time-step propagator in velocity gauge [34,35]. Reflection from the box boundaries is prevented by complex absorbing potentials.…”

Section: Computation Of the Atas Spectrummentioning

confidence: 99%

Dressing effects in the attosecond transient absorption spectra of doubly excited states in helium

et al. 2015

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“…Since the additional delay introduced by the IR probe pulse via the so-called Coulomb-laser coupling can be estimated independently and subtracted from the measured result [10][11][12], this phase-energy difference approach in RABITT comensurates with the WignerSmith route [13,14] to determine emission time delay that involves energy-differential of the photoamplitude phase. Important recent measurements using the RA-BITT technique include relative delay between argon 3s and 3p photoemission [4,5], between emissions from various noble-gas atoms [15], Ar 3p photorecombination delay and phase at the 3p Cooper minimum (CM) [16], and the Ar 3p emission phase at a Fano autoionizing resonance [18,19].…”

Section: Introductionmentioning

confidence: 99%

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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“…They are ideal probing tools to study electronic correlation dynamics which may or may not be modified by an external laser pulse. Both aspects have been demonstrated in helium by measuring photons via transient absorption spectroscopy [28] and photoelectrons via RABITT [29].…”

Section: Introductionmentioning

confidence: 99%

Stability of the time-dependent configuration-interaction-singles method in the attosecond and strong-field regimes: A study of basis sets and absorption methods

et al. 2016

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We investigate the behavior of several spatial grid methods and complex absorbers for strong-field and attosecond scenarios when using the time-dependent configuration-interaction singles method to solve the multielectron time-dependent Schrödinger equation for atoms. We compare the pseudospectral grid, finite-element, and finite-element-discrete-variable-representation (DVR) methods with each other and discuss their advantages and disadvantages. Additionally, we study the performances of complex absorbing potential (CAP) and smooth exterior complex scaling (SES) to absorb the outgoing electron. We find that SES performs generally better than CAP for calculating high-harmonic generation spectra and XUV photoelectron spectra. In both of these cases, the DVR and even more the FEM grid representations show more reliable results-especially when using SES. Both absorbers show drawbacks when calculating photoelectron spectra in the strong-field regime.

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Modulation of Attosecond Beating in Resonant Two-Photon Ionization

Cited by 72 publications

References 53 publications

Dressing effects in the attosecond transient absorption spectra of doubly excited states in helium

Dressing effects in the attosecond transient absorption spectra of doubly excited states in helium

Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

Stability of the time-dependent configuration-interaction-singles method in the attosecond and strong-field regimes: A study of basis sets and absorption methods

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