What's the differences of "hopping", "tunneling" and "superexchange"?

In such as "Electron Tunneling Pathways and Role of Adenine in Repair of Cyclobutane Pyrimidine Dimer by DNA Photolyase", J. Am. Chem. Soc. 2012, 134, 8104 − 8114

06 June 2014 4,764 11 View