2019/03/27 by V. Gruson, L. Barreau, Á. Jiménez-Galan +11 · 1 citation
Physics and Astronomy · #physics.atom-ph
paper · pdf · doi:10.1126/science.aah5188
published as Science 11 Nov 2016:Vol. 354, Issue 6313, pp. 734-738
arxiv created 2019/03/27 · arxiv updated 2019/03/29
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.