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We examine the nature and statistical properties of electron-electroncollisions in the recollision process in a strong laser field. The separationof the double ionization yield into sequential and nonsequential componentsleads to a bell-shaped curve for the nonsequential probability and amonotonically rising one for the sequential process. We identify key featuresof the nonsequential process and connect our findings in a simplified modelwhich reproduces the knee shape for the probability of double ionization withlaser intensity and associated trends.

From recollisions to the knee: A road map for double ionization in intense laser fields