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We present numerical simulations demonstrating efficient control of electron dynamics in small molecular systems driven by a train of half-cycle pulses. Using the $H_2^+$ molecule as a model system, we achieve a high degree of localization of the electron in the dissociative channel. Considering a system resembling the $O_2^+$ molecule, we find transient localization of the bound electron. By varying the parameters of the driving field, we systematically explore the underlying control mechanisms. |