title: Correlated electron dynamics in nonsequential double ionization of molecules by mid-infrared fields.
abstract: The electron dynamics in strong field nonsequential double ionization (NSDI) of nitrogen molecules by mid-infrared (MIR) laser pulses is investigated with the three-dimensional classical ensemble model. The numerical results show that in the MIR regime, the correlated behavior of the two electrons from NSDI is independent on the molecular alignment, contrary to the case in the near-infrared (NIR) regime where the electron correlations exhibit a strong alignment dependence. In consistent with the experimental results, our numerical results show that the longitudinal momentum spectrum of the doubly charged ion evolves from a wide single-hump structure at NIR regime into a double-hump structure when wavelength enters the MIR regime. This double-hump structure becomes more pronounced as the wavelength further increases. The responsible microscopic electron dynamics of NSDI at the MIR regime is explored by back analysis of the classical trajectories.
authors.affiliation: Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Qingbin
authors.initials: Q
authors.lastname: Tang
authors.forename: Yueming
authors.initials: Y
authors.lastname: Zhou
authors.forename: Cheng
authors.initials: C
authors.lastname: Huang
authors.forename: Qing
authors.initials: Q
authors.lastname: Liao
authors.forename: Peixiang
authors.initials: P
authors.lastname: Lu
mesh_terms: D003198:Computer Simulation; D004579:Electron Transport; D004583:Electrons; D007259:Infrared Rays; D007477:Ions; D008956:Models, Chemical; D011789:Quantum Theory; D013223:Statistics as Topic
chemical_list: D007477:Ions