Feldberg plots

The information obtained from the triple-potential-step experiment is also contained in the parameters governing luminescence decay. The appropriate relationship (usually called the Feldberg plots) can be derived after an analytical treatment of diffusion (to and from the electrode) and the overall electron transfer rate. In the simplest cases (i.e., in direct formation of an emissive state in electron transfer event or in the ECL systems producing light mainly according to E-route), relationship between I(Atg) and (fF/AfR)1/2 terms is expected to be linear with the slope-to-intercept ratio equal to 0.959 as follows ... 

The appropriate relationship (usually called a Feldberg plot [105,106]) can be derived after an analytical treatment of diffusion (to and from the electrode) and the overall electron transfer rate. In the case of the simple S-route, the appropriate plots. 

In the case of charge-transfer emission (formally a bimolecular reation), Feldberg plots are also linear (e.g., [118]). The charge-transfer character of this emission, however, can be demonstrated by a correlation of emission energies of various ECL systems with the standard redox potential (e.g., correlation of the emission maxima with the oxidation potentials of the donor or with the reduction potentials of the acceptors [119]). The associated charge-transfer character can also be demonstrated by the effects of solvent and temperature on the emission energy and intensity (e.g., [120]). 

In an ECL experiment the application of a triple-potential-step sequence causes very intense and bright emission. The ECL emission bands, exhibiting charge-transfer character, agree well with those observed with photoexcitation. The Feldberg plot analysis indicates that the emissive excited state is formed directly by electron transfer between A -D and A -D. In most cases, the emitted light intensities were found to be linear vs. according to Eq. (43) thus in the time scale of ECL... 

Feldberg plot 23, 24, 35 Franck-Condon principle 5, 6, 10 Franck-Condon factor 10, 53, 54 FRASTA 160 Freeze-thaw test 244 Friction factor 135 Fullerene 107, 347... 

Measurements from a downtown site in Frankfurt-am-Main and another on a nearby 800-m mountain, Kleiner Feldberg, both in the Federal Republic of Germany, are plotted in Figure 4-1. As opposed to the pattern in New York State," the ozone concentration at the urban... 

When initially experimenting with unequal intervals using Feldberg s function, it was found that a > 2 leads to somewhat oscillatory behaviour, as does large Xq. The combination a = 2 and Xq = 3 seems about optimal and leads to a satisfactory convergence of the error plot. 

Feldberg and Reppucci developed a novel separation of anomeric alpha (pharmacologic) purines carried out by copper acetate chiral plates. Solvents were methanol-water-ACN. Visualization occurred through UV. Graphs were plotted based on alteration of ACN percentages. 

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