Mobile excitation

The above reaction scheme was established by a combination of uv-visible absorption and fluorescence, ir isotopic substitution, esr and kinetic measurements (37). The important point to note here is that in 02 rich Xe matrices, ground state Cu(2Sj/2) cannot avoid reactive encounters with 02 to form Cu(02)2 and Cu(02) dioxygen complexes,whereas it is proposed that the formation of CuO, Cu(03) and 03 in dilute 02/Xe matrices arises from the reaction of a long lived mobile excited state Cu(2D) with 02. On the other hand the reactions of photoexcited Ag(2P) with 02 are different (37), electron transfer being favoured to form Ag 02. ... 

A complete understanding of the conduction processes has not yet been obtained. It is clear that at least two types of processes are required charge transport along the chains and charge transport between the chains. Transport along the chains may be possible because of the formation of various kinds of pseudo-particles, such as solitons and polarons, which are localised but mobile excitations (Bower, 2002). 

It is clear from our results that the initial excitation in solid polystyrene must be extremely mobile in contrast to the case of the polymer in solution. However, it is now clear that available experimental results do not directly examine the mobile excitation. In particular, observed "monomer-like" emission is due to a shallow trap, which vitiates a previous analysis (Id,18) that assumed it to be due to the mobile excitation. Direct determination of mobile excitation dynamics will require extension of photophysical measurements to the picosecond time regime and efforts by us to accomplish this goal are now in progress. 

Pooling was one of the many possibilities imagined in early work, but its importance for MALDI requires more than excited neighbor pairs randomly created by the laser. These are not sufficiently numerous except at very high intensities." However, excitations can be mobile in the solid state, greatly increasing their interaction probability. " Mobile excitations can be treated as pseudo-particles and are denoted excitons. ... 

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