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

Argenti, Luca; Jiménez-Galán, Álvaro; Marante, Carlos; Ott, Christian; Pfeifer, Thomas; Martı́n, Fernando

doi:10.1103/physreva.91.061403

Cited by 41 publications

(28 citation statements)

References 53 publications

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“…In Fig. 1c it is not possible to discern the characteristic hyperbolic fringes associated to the free-induction decay expected for isolated states [44,52,53]. However, all peaks do appear to be broader at negative time delays, when the SWIR follows the X-ray pulse.…”

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confidence: 90%

Attosecond transient absorption spectrum of argon at the L2,3 edge

et al. 2018

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Progress in high-harmonic generation has led to high-energy attosecond pulses with cutoff above the carbon 1s edge (283.8 eV). These pulses are essential to extend time-resolved spectroscopies to the water window in order to control electron dynamics in solvated organic species. Here we report a major step towards this goal: the measurement, with sub-cycle time resolution, of the attosecond transient absorption spectrum of argon at the 2p −1 L2,3-edge (∼250 eV) in the presence of a shortwave infrared control pulse. The measurements, supported by theoretical simulations, demonstrate the concurrent role of Auger decay and tunnel ionization in the driven evolution of inner-valence holes of polyelectronic atoms.

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confidence: 90%

Attosecond transient absorption spectrum of argon at the L2,3 edge

et al. 2018

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“…During last decade, autoionizing states of argon [28] and helium [29][30][31][32][33][34][35][36][37] were reinvestigated experimentally by the pumpprobe scheme and theoretically by implying sophisticated models [38,39] and numerical solution of the time-dependent Schrödinger equation [40]. In almost all studies mentioned above, a control over the Fano-interference has been achieved by an interplay between the intense high-frequency pump and low-frequency probe pulses.…”

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confidence: 99%

Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly excited state of He

2017

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The photoionization of a helium atom by short intense laser pulses is studied theoretically in the vicinity of the 2s2p 1 P doubly-excited state with the intention to investigate the impact of the intensity and duration of the exciting pulse on the dynamics of the autoionization process. For that purpose, we solve numerically the corresponding time-dependent Schrödinger equation by applying the time-dependent restricted-active-space configuration-interaction method (TD-RASCI). The present numerical results clearly demonstrate that the Fano-interferences can be controlled by a single high-frequency pulse. As long as the pulse duration is comparable to the autoionization lifetime, varying the peak intensity of the pulse enables manipulation of the underlying Fano-interference. In particular, the asymmetric profile observed for the 2s2p 1 P doubly-excited state of He in the weak-field ionization can be smoothly transformed to a window-type interference profile.

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“…With high-order harmonic generation sources, the resonant excitation and probe of these transitions under the influence of ultrashort NIR lasers became experimentally accessible. The interest has focused particularly on investigating the laser coupling of two-electron dynamics with intense NIR sources [6][7][8][9][10][11]. More recently, a study revealed the temporal build-up of the Fano resonance around an isolated doubly excited state [12].…”

Section: Introductionmentioning

confidence: 99%

Line-shape broadening of an autoionizing state in helium at high XUV intensity

et al. 2022

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We study the interaction of intense extreme ultraviolet (XUV) light with the 2s2p doubly excited state in helium. In addition to previously understood energy-level and phase shifts, high XUV intensities may lead to other absorption line shape distortions. Here, we report on experimental transient-absorption spectroscopy results on the 2s2p line width modification in helium in intense stochastic XUV fields. A few-level model simulation is realized to investigate the origins of this effect. We find that the line shape broadening is connected to the strong coupling of the ground state to the 2s2p doubly excited state which is embedded in the ionization continuum. As the broadening takes place for intensities lower than for other strong-coupling processes, e.g. observing asymmetry changes of the absorption profile, this signature can be identified already in an intermediate intensity regime. These findings are in general relevant for resonant inner shell transitions in nonlinear experiments with XUV and x-ray photon energies at high intensity.

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

Cited by 41 publications

References 53 publications

Attosecond transient absorption spectrum of argon at the L2,3 edge

Attosecond transient absorption spectrum of argon at the L2,3 edge

Impact of intense laser pulses on the autoionization dynamics of the 2s2p doubly excited state of He

Line-shape broadening of an autoionizing state in helium at high XUV intensity

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