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.
Highlights
Nonsequential double ionization (NSDI) is a fundamental process in laser-matter interaction
With the 3D fully classical ensemble model [15], we investigate the correlated electron dynamics in NSDI of N2 by the MIR laser pulses
Our numerical results show that the correlated behavior of the two electrons from NSDI in the MIR regime is independent of the molecular alignment, contrary to the case in the NIR regime where the electron correlations exhibit a strong alignment dependence [28]
Summary
Nonsequential double ionization (NSDI) is a fundamental process in laser-matter interaction. [25, 26], it has been shown that the shape of longitudinal momentum distributions of the doubly charged ion for atoms and molecules shows a double-hump structure in the MIR regime, different from the case in the NIR regime where it is a single-hump structure. This double-hump becomes more pronounced as the wavelength further increases [25, 26]. The intensity dependence of longitudinal momentum distributions of the doubly charged ion is discussed
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