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Fluxional (or non-rigid) molecules are molecules that undergo dynamics such that some or all of their nuclei interchange, or tunnel, between symmetrically equivalent positions. Because virtually all molecules are fluxional at some time scale, the term fluxional depends on the method used to assess the dynamics. A molecule is considered to be fluxional if its spectroscopic signature exhibits line-splitting, or line-broadening beyond that dictated by the Heisenberg uncertainty principle.

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