Photoemission-time-delay measurements and calculations close to the 3<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-ionization-cross-section minimum in Ar

Guénot, Diego; Klünder, Kathrin; Arnold, Cord L.; Kroon, David; Dahlström, Jan Marcus; Miranda, Miguel; Fordell, Thomas; Gisselbrecht, Mathieu; Johnsson, Per; Mauritsson, Johan; Lindroth, Eva; Maquet, Alfred; Taïeb, Richard; L’Huillier, Anne; Kheifets, Anatoli

doi:10.1103/physreva.85.053424

Cited by 123 publications

(195 citation statements)

References 33 publications

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“…The atomic delay difference between the 3p and 3s orbitals is ∼ 78 as at an XUV photon energy of ∼ 37 eV, which is consistent with the experimental value of 100 ± 50 presented in Ref. [4]. Figure 5: The "exact" continuum-continuum delay is determined for all outermost n shell electrons in neon and argon as τ CC ≡ τ A − τ W using Eq.…”

Section: Resultssupporting

confidence: 68%

“…Experimental studies have evidenced relative delays between different ionization processes of various target systems including both solid-state surfaces [1] and atomic gases [2,3,4]. This has stimulated a number of theoretical investigations concerning the role of the long-range Coulomb potential [3,5,6], many-electron screening effects [4,7,8] and electron localization [9]. The delayed response of atomic systems can be decomposed as the sum of two terms [3,10]:…”

Section: Introductionmentioning

confidence: 99%

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Diagrammatic approach to attosecond delays in photoionization

2012

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We study laser-assisted photoionization by attosecond pulses using a time-independent formalism based on diagrammatic many-body perturbation theory. Our aim is to provide an ab inito route to the "delays" for this above-threshold ionization process, which is essential for a quantitative understanding of attosecond metrology. We present correction curves for characterization schemes of attosecond pulses, such as "streaking", that account for the delayed atomic response in ionization from neon and argon. We also verify that photoelectron delays from many-electron atoms can be measured using similar schemes if, instead, the so-called continuum-continuum delay is subtracted. Our method is general and it can be extended also to more complex systems and additional correlation effects can be introduced systematically.

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Section: Resultssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Diagrammatic approach to attosecond delays in photoionization

2012

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“…Temporal characterization of attosecond pulses, which requires determination of the spectral phase of the XUV field, can be performed by laser-assisted photoionization [4,5]. More recently, this type of experiments have been used for spectral phase determination of photoelectrons from autoionizing states [6,7] and for the measurement of relative time delays in laser-assisted photoionization from different initial states in solids [8] and atoms [9][10][11]. Relative time delays have also been measured between different atomic species [12][13][14], between single and double ionization [15], between different angles of photoemission [16] and between the ion ground state and shake-up states [17].…”

Section: Introductionmentioning

confidence: 99%

Attosecond delays in laser-assisted photodetachment from closed-shell negative ions

Lindroth

Dahlström

2017

Phys. Rev. A

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We study laser-assisted photodetachment time delays by attosecond pulse trains from the closedshell negative ions F − and Cl − . We investigate the separability of the delay into two contributions: (i) the Wigner-like delay associated with one-photon ionization by the attosecond pulse train and (ii) the delay associated with exchange of an additional laser photon in the presence of the potential of the remaining target. Based on the asymptotic form of the wave packet, the latter term is expected to be negligible because the ion is neutralized leading to a vanishing laser-ion interaction with increasing electron-atom separation. While this asymptotic behavior is verified at high photoelectron energies, we also quantify sharp deviations at low photoelectron energies. Further, these low-energy delays are clearly different for the two studied anions indicating a breakdown of the universality of laser-ion induced delays. The fact that the short-range potential can induce a delay of as much as 50 as can have implications for the interpretation of delay measurements also in other systems that lack long-range potential.

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“…Recent interests of such experiments [1][2][3][4][5] owe to the technology in generating attosecond single pulse [6,7] and pulse trains [8,9]. Of particular attraction are the experiments based on the interferometric metrology, namely, the reconstruction of attosecond beating by interference of two-photon transitions (RABITT) [8], in which photoelectrons emitted by a coherent XUV comb of odd harmonics (pump) driven by a tunable fundamental field subsequently absorb or emit a synchronized IR photon (probe).…”

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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Photoemission-time-delay measurements and calculations close to the 3s-ionization-cross-section minimum in Ar

Cited by 123 publications

References 33 publications

Diagrammatic approach to attosecond delays in photoionization

Diagrammatic approach to attosecond delays in photoionization

Attosecond delays in laser-assisted photodetachment from closed-shell negative ions

Attosecond delay of xenon4dphotoionization at the giant resonance and Cooper minimum

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