title: Attosecond dynamics through a Fano resonance: Monitoring the birth of a photoelectron.
abstract: The dynamics of quantum systems are encoded in the amplitude and phase of wave packets. However, the rapidity of electron dynamics on the attosecond scale has precluded the complete characterization of electron wave packets in the time domain. Using spectrally resolved electron interferometry, we were able to measure the amplitude and phase of a photoelectron wave packet created through a Fano autoionizing resonance in helium. In our setup, replicas obtained by two-photon transitions interfere with reference wave packets that are formed through smooth continua, allowing the full temporal reconstruction, purely from experimental data, of the resonant wave packet released in the continuum. In turn, this resolves the buildup of the autoionizing resonance on an attosecond time scale. Our results, in excellent agreement with ab initio time-dependent calculations, raise prospects for detailed investigations of ultrafast photoemission dynamics governed by electron correlation, as well as coherent control over structured electron wave packets.
authors.affiliation: LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France.
authors.forename: V
authors.initials: V
authors.lastname: Gruson
authors.affiliation: LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France.
authors.forename: L
authors.initials: L
authors.lastname: Barreau
authors.affiliation: Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: Á
authors.initials: Á
authors.lastname: Jiménez-Galan
authors.affiliation: Sorbonne Université, UPMC Université Paris 6, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75231 Paris Cedex 05, France, and CNRS, UMR 7614, LCPMR, Paris, France.
authors.forename: F
authors.initials: F
authors.lastname: Risoud
authors.affiliation: Sorbonne Université, UPMC Université Paris 6, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75231 Paris Cedex 05, France, and CNRS, UMR 7614, LCPMR, Paris, France.
authors.forename: J
authors.initials: J
authors.lastname: Caillat
authors.affiliation: Sorbonne Université, UPMC Université Paris 6, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75231 Paris Cedex 05, France, and CNRS, UMR 7614, LCPMR, Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Maquet
authors.affiliation: LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France.
authors.forename: B
authors.initials: B
authors.lastname: Carré
authors.affiliation: LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France.
authors.forename: F
authors.initials: F
authors.lastname: Lepetit
authors.affiliation: LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France.
authors.forename: J-F
authors.initials: JF
authors.lastname: Hergott
authors.affiliation: LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France.
authors.forename: T
authors.initials: T
authors.lastname: Ruchon
authors.affiliation: Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Argenti
authors.affiliation: Sorbonne Université, UPMC Université Paris 6, UMR 7614, Laboratoire de Chimie Physique-Matière et Rayonnement, 75231 Paris Cedex 05, France, and CNRS, UMR 7614, LCPMR, Paris, France.
authors.forename: R
authors.initials: R
authors.lastname: Taïeb
authors.affiliation: Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain. fernando.martin@uam.es pascal.salieres@cea.fr.|Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, 28049 Madrid, Spain.|Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Martín
authors.affiliation: LIDYL, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-Sur-Yvette, France. fernando.martin@uam.es pascal.salieres@cea.fr.
authors.forename: P
authors.initials: P
authors.lastname: Salières