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Both uncorrelated ("sequential") and correlated ("nonsequential") processescontribute to the double ionization of the helium atom in strong laser pulses.The double ionization probability has a characteristic "knee" shape as afunction of the intensity of the pulse. We investigate the phase-space dynamicsof this system, specifically by finding the dynamical structures that regulatethe ionization processes. The emerging picture complements the recollisionscenario by clarifying the distinct roles played by the recolliding and coreelectrons. Our analysis leads to verifiable predictions of the intensitieswhere qualitiative changes in ionization occur, leading to the hallmark "knee"shape.

Strong field double ionization: What is under the "knee"?