title: Tracking autoionizing-wave-packet dynamics at the 1-fs temporal scale.
abstract: We present time-resolved studies and Fourier transform spectroscopy of inner-shell excited states undergoing Auger decay and doubly excited autoionizing states, utilizing coherent extreme-ultraviolet (XUV) radiation continua. Series of states spanning a range of ∼4  eV are excited simultaneously. An XUV probe pulse tracks the oscillatory and decaying evolution of the formed wave packet. The Fourier transform of the measured trace reproduces the spectrum of the series. The present work paves the way for ultrabroadband XUV spectroscopy and studies of ultrafast dynamics in all states of matter.
authors.affiliation: Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, GR-711 10 Heraklion, Crete, Greece.
authors.forename: E
authors.initials: E
authors.lastname: Skantzakis
authors.forename: P
authors.initials: P
authors.lastname: Tzallas
authors.forename: J E
authors.initials: JE
authors.lastname: Kruse
authors.forename: C
authors.initials: C
authors.lastname: Kalpouzos
authors.forename: O
authors.initials: O
authors.lastname: Faucher
authors.forename: G D
authors.initials: GD
authors.lastname: Tsakiris
authors.forename: D
authors.initials: D
authors.lastname: Charalambidis