Phase-controlled optical pulses and the adiabatic electronic sign change

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Abstract
It is shown that the time development of the electronic Berry phase predicted to accompany molecular pseudorotation around a conical degeneracy is accessible to measurement with pairs of vibrationally abrupt phase-controlled optical pulses. In the simplest case, an electronic sign change resulting from the induced vector potential will manifest itself as a delay-dependent oscillation in the interference signal with twice the period of pseudorotational motion.

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