Lateral electron transport, effect surface

The conceptual model followed is the simple three step process where a photon enters the solid causing a transition, the excited electron transports to the surface, and exits. It is assumed that relatively little of interest to a discussion of the excited state (two-peak) structure occurs in the transport so all attention is focussed on the transition. No consideration is given to resonance effects as they are assumed to be a modulation in the driving rate that will cancel out in the energetics. As will be discussed later, in the case that one restricts consideration solely to the two primary channels, one is basically studying the poorly screened and fully screened model (Fuggle et al. 1980) that has been used successfully to interpret the data for the lanthanides (Gudat et al. 1982). 

An SECM feedback response to an electroactive polymer film can be controlled either by ET kinetics at the film-solution interface or by film conductivity. The contribution of lateral film conductivity to the effective ET rate measured by SECM was addressed in the recent study of polyaryl multilayers attached with ferrocenes [65] or ferrocene-terminated dendrimers [69] on unbiased carbon electrodes. In the latter study, the dependence of apparent ET rate constant, feei. on the generation of dendrimers (Table 6.2) was ascribed to the different efficiencies of electron transport inside and between dendrimers (Figure 6.22). Interestingly, the theory of the aforementioned triple potential step method predicts its potential to separately determine heterogeneous ET rate and lateral conductivity for a thin polymer film coated on an insulating surface [70]. 

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