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Two-electron correlated spectra of non-sequential double ionization belowlaser-intensity threshold are known to exhibit back-to-back scattering of theelectrons, viz., the anticorrelation of the electrons. Currently, the widelyaccepted interpretation of the anticorrelation is recollision-inducedexcitation of the ion plus subsequent field ionization of the second electron.We argue that another mechanism, namely simultaneous electron emission, whenthe time of return of the rescattered electron is equal to the time ofliberation of the bounded electron (the ion has no time for excitation), canalso explain the anticorrelation of the electrons in the deep belowlaser-intensity threshold regime. Our conclusion is based on the results of thenumerical solution of the time-dependent Schr\"{o}dinger equation for a modelsystem of two one-dimensional electrons as well as an adiabatic analytic modelthat allows for a closed-form solution.

Non-sequential double ionization below laser-intensity threshold: Anticorrelation of electrons without excitation of parent ion