Attosecond dynamics through a Fano resonance: Monitoring the birth of a photoelectron

Amplitude and phase of wavepackets encode the dynamics of quantum systems. However, the rapidity of electron dynamics on the attosecond timescale has precluded their complete measurement in the time domain. Here, we demonstrate that spectrally-resolved electron interferometry reveals the amplitude a...

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Published inarXiv.org
Main Authors Gruson, V, Barreau, L, Jiménez-Galan, Á, Risoud, F, Caillat, J, Maquet, A, Carré, B, Lepetit, F, J-F Hergott, Ruchon, T, Argenti, L, Taïeb, R, Martín, F, Salières, P
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 27.03.2019
Subjects
Amplitudes
Dynamic structural analysis
Dynamics
Electrons
Fano resonance
Helium
Photoelectric emission
Photoelectrons
Physics - Atomic Physics
Time dependence
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Summary:Amplitude and phase of wavepackets encode the dynamics of quantum systems. However, the rapidity of electron dynamics on the attosecond timescale has precluded their complete measurement in the time domain. Here, we demonstrate that spectrally-resolved electron interferometry reveals the amplitude and phase of a photoelectron wavepacket created through a Fano autoionizing resonance in helium. Replicas obtained by two-photon transitions interfere with reference wavepackets formed through smooth continua, allowing the full temporal reconstruction, purely from experimental data, of the resonant wavepacket released in the continuum. This in turn resolves the buildup of the autoionizing resonance on attosecond timescale. Our results, in excellent agreement with ab initio time-dependent calculations, raise prospects for both detailed investigations of ultrafast photoemission dynamics governed by electron correlation, as well as coherent control over structured electron wave-packets.
ISSN:2331-8422
DOI:10.48550/arxiv.1903.11698