Interferometer within a molecule

Abstract
We show how interferometry can be carried out within a molecule. The method can be used to test semiclassical quantum mechanics and to map out Born-Oppenheimer energy surfaces. The interference occurs between molecular wave packets that travel through different molecular states. Packet splitting and recombination is carried out at laser-induced level crossings. We have compared the exact quantum-mechanical behavior (calculated numerically on a Cray computer) with a pseudoclassical method.

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