Theory of Chemically Induced Dynamic Polarization in Thin Films

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Abstract
An analysis is presented for radical recombination according to a continuous diffusion model for two and three dimensional systems in the context of chemically induced dynamic polarization (CIDNP) experiments. It is argued that diffusional models of molecular motion are most sensitive to changes in dimensionality and that CIDNP or other experiments carried out in thin film, quasi‐two dimensional systems, should reveal these effects. The reason for this sensitivity is that according to a diffusion model dynamical quantities of interest will decay more slowly in two dimensions rather than three. We discuss how these conclusions apply to a variety of experiments and two additional examples are cited.