Recent years have seen a flurry of activity in both the theoretical and exper-imental aspects of control over molecular processes [1] (see also S. A. Rice, "Perspectives on the Control of Quantum Many-Body Dynamics: Applica-tion to Chemical Reactions," this volume). Most of the emphasis has been on the use of optical fields as a means for control, although other approaches can be envisioned in special circumstances [2]. The key underlying principle of the overall subject is the achievement of control through the manipulation of quantum wave interferences [1, 3], although full control will surely not be lost in the incoherent regime.
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