title: Attosecond correlated dynamics of two electrons passing through a transition state.
abstract: The strong-field induced decay of a doubly excited, transient Coulomb complex Ar**→Ar(2+)+2e(-) is explored by tracing correlated two-electron emission in nonsequential double ionization of Ar as a function of the carrier-envelope phase. Using <6 fs pulses, electron emission is essentially confined to one optical cycle. Classical model calculations support that the intermediate Coulomb complex has lost memory of its formation dynamics and allows for a consistent, though model-dependent definition of "emission time," empowering us to trace transition-state two-electron decay dynamics with sub-fs resolution. We find a most likely emission time difference of ∼200±100 as.
authors.affiliation: Max-Planck-Institut für Kernphysik, Heidelberg, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Camus
authors.forename: B
authors.initials: B
authors.lastname: Fischer
authors.forename: M
authors.initials: M
authors.lastname: Kremer
authors.forename: V
authors.initials: V
authors.lastname: Sharma
authors.forename: A
authors.initials: A
authors.lastname: Rudenko
authors.forename: B
authors.initials: B
authors.lastname: Bergues
authors.forename: M
authors.initials: M
authors.lastname: Kübel
authors.forename: N G
authors.initials: NG
authors.lastname: Johnson
authors.forename: M F
authors.initials: MF
authors.lastname: Kling
authors.forename: T
authors.initials: T
authors.lastname: Pfeifer
authors.forename: J
authors.initials: J
authors.lastname: Ullrich
authors.forename: R
authors.initials: R
authors.lastname: Moshammer