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The electronic tunnel factor in homogeneous long-range electron transfer (ET) systems has been characterized experimentally and theoretically in great detail. Outstanding questions, however, remain, for example interference in multiple ET routes and environmentally induced barrier fluctuations. Well characterized electrochemical long-range ET systems have also become available where the tunnel factor...
Proton transfer in chemical, physical, and biological systems frequently involves low and shallow barriers. This is caused by strong donor-acceptor interaction which also imposes fully adiabatic character on the process. Low or shallow barriers are not covered straightforwardly by tunnel views otherwise central in proton transfer theory. We introduce a formalism focused on a shallow enough proton...
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