Figure 4.

Spectral functions for electron removal (from Z, G, and I) and insertion (on ¹SA* and ¹PA*). It is assumed that |ΔG⁰| < λ. Τhe arrows represent the ET from the bases to the excited acceptor species. The peak in the product between insertion and removal functions defines the most probable tunneling energy for the ET process, indicated by the short, dark, horizontal bars for each process. The tunneling energy gaps are indicated (Right). The larger the tunneling energy gap, the larger the predicted value of β is.