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

Abstract

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.

References in corpus (2)

• Femtosecond induced transparency and absorption in the extreme ultraviolet by coherent coupling of the He 2s2p (1P0) and 2p2 (1Se) double excitation states with 800 nm light
• Modulation of attosecond beating in resonant two-photon ionization

Cited by in corpus (6)

• Time-resolved high harmonic spectroscopy of dynamical symmetry breaking in bi-circular laser fields
• Attosecond delays in laser-assisted photodetachment from closed-shell negative ions
• A new perspective on the Fano absorption spectrum in terms of complex spectral analysis
• High harmonic generation in an active grating
• Effect of electron correlations on attosecond photoionization delays in the vicinity of the Cooper minima of argon
• Temporal Resolution of the RABBITT technique