Observing the ultrafast buildup of a Fano resonance in the time domain

Kaldun, Andreas; Blättermann, Alexander; Stooß, Veit; Donsa, Stefan; Wei, Hui; Pazourek, Renate; Nagele, Stefan; Ott, Christian; Lin, C. D.; Burgdörfer, Joachim; Pfeifer, Thomas

doi:10.1126/science.aah6972

Cited by 158 publications

(143 citation statements)

References 36 publications

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“…Our results agree very well with the average group delay measurements using discrete harmonics [10], showing almost a shift in phase at photon energies ranging from 26 to 30 eV, corresponding to the energy position of the well-known 3s3p 6 np autoionizing series of Ar [14]. Furthermore, the ACDC reconstruction reveals new group-delay features between 30-35 eV that could not be resolved by other techniques.…”

Section: Introductionsupporting

confidence: 87%

Complete phase retrieval of photoelectron wavepackets

et al. 2020

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Coherent, broadband pulses of extreme ultraviolet (XUV) light provide a new and exciting tool for exploring attosecond electron dynamics. Using photoelectron streaking, interferometric spectrograms can be generated that contain a wealth of information about the phase properties of the photoionization process. If properly retrieved, this phase information reveals attosecond dynamics during photoelectron emission such as multielectron dynamics and resonance processes. However, until now, the full retrieval of the continuous electron wavepacket phase from isolated attosecond pulses has remained challenging. Here, after elucidating key approximations and limitations that hinder one from extracting the coherent electron wavepacket dynamics using available retrieval algorithms, we present a new method called Absolute Complex Dipole transmission matrix element reConstruction (ACDC). We apply the ACDC method to experimental spectrograms to resolve the phase and group delay difference between photoelectrons emitted from Ne and Ar. Our results reveal subtle dynamics in this group delay difference of photoelectrons emitted form Ar. These group delay dynamics were not resolvable with prior methods that were only able to extract phase information at discrete energy levels, emphasizing the importance of a complete and continuous phase retrieval technique such as ACDC. Here we also make this new ACDC retrieval algorithm available with appropriate citation in return.

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Section: Introductionsupporting

confidence: 87%

Complete phase retrieval of photoelectron wavepackets

et al. 2020

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“…Here, we report the experimental observation of the ultrafast formation of a Fano resonance, namely the helium 2s2p spectral line via highresolution XUV absorption spectroscopy [10]. In order to monitor the buildup of the absorption line, we apply an intense few-cycle near-infrared laser pulse which rapidly depletes the excited state via strong-field ionization.…”

Section: Related Contentmentioning

confidence: 99%

Watching the emergence of a Fano resonance in doubly excited helium

Blättermann

Kaldun

Stooß

et al. 2017

J. Phys.: Conf. Ser.

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“…Attosecond XUV pulses phase-locked to laser fields have been used to study bound electron dynamics in atoms [2] and autoionization processes [3] in real time. 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].…”

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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Observing the ultrafast buildup of a Fano resonance in the time domain

Cited by 158 publications

References 36 publications

Complete phase retrieval of photoelectron wavepackets

Complete phase retrieval of photoelectron wavepackets

Watching the emergence of a Fano resonance in doubly excited helium

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

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