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In the most frequent case, the acceptor component in the nanofibers interacts with a distribution of donor chromophores. The distance between individual donors and the low-energy gap acceptor unit can be limited not only by the effective molecular radius, as in bulk samples, but also by the nanofiber radius (a condition especially relevant for very thin, 10 nm fibers). We will come back to this issue in the next pages. In general, the energy transfer dynamics can be described by means of rate equations for the populations, Hdo tiAc) of D (A) in the excited state, also taking into account that a fraction of molecules of the donor polymer can be directly excited (i.e., by direct absorption of incident excitation photons) ... 

This first chapter provides an introduction to Mossbauer spectroscopy and a background for the subsequent chapters. Hence the next few pages contain a general discussion of the Mossbauer effect, the conditions necessary for its observation, and the way in which Mossbauer... 

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