title: Multiphoton double ionization of Ar and Ne close to threshold.
abstract: In kinematically complete studies we explore double ionization (DI) of Ne and Ar in the threshold regime (I>3x10{13} W/cm{2}) for 800 nm, 45 fs pulses. The basic differences are found in the two-electron momentum distributions-"correlation" (CO) for Ne and "anticorrelation" (ACO) for Ar-that can be partially explained theoretically within a 3D classical model including tunneling. Transverse electron momentum spectra provide insight into "Coulomb focusing" and point to correlated nonclassical dynamics. Finally, DI threshold intensities, CO as well as ACO regimes are predicted for both targets.
authors.affiliation: Max-Planck-Institut für Kernphysik, D-69117 Heidelberg, Germany. Yunquan.liu@pku.edu.cn
authors.forename: Yunquan
authors.initials: Y
authors.lastname: Liu
authors.forename: Difa
authors.initials: D
authors.lastname: Ye
authors.forename: Jie
authors.initials: J
authors.lastname: Liu
authors.forename: A
authors.initials: A
authors.lastname: Rudenko
authors.forename: S
authors.initials: S
authors.lastname: Tschuch
authors.forename: M
authors.initials: M
authors.lastname: Dürr
authors.forename: M
authors.initials: M
authors.lastname: Siegel
authors.forename: U
authors.initials: U
authors.lastname: Morgner
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong
authors.forename: R
authors.initials: R
authors.lastname: Moshammer
authors.forename: J
authors.initials: J
authors.lastname: Ullrich