Abstract

We present results from a series of ab initio calculations that investigate the relative efficiency of tunneling via through-bond and through-space interactions. We use model systems and methods ranging from Hartree–Fock theory to coupled cluster singles and doubles and show that while the through-space coupling decays more rapidly with distance than does through-bond coupling, the prefactor to the exponential decay for through-space coupling is considerably larger than has been previously supposed. The implications of these results are then discussed.

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