Inter- and Intramolecular Energy Transfer Processes. 4. Hydrogen-Hydrocarbon Systems

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Abstract
Extensive experiments have confirmed our earlier conclusion that long-range energy transfer does not occur between pairs of molecules in solution. Evidence is brought forward to show that the transfer of excitation energy from terphenyl to diphenyl hexatriene under x-ray bombardment in liquid scintillators must be due to a short-range process which occurs after the formation of a molecular complex between diphenyl hexatriene and either a positive terphenyl ion or a very highly excited terphenyl molecule. Results of experiments in heterogeneous systems, in which transfer of excitation energy from adsorbed component to host crystal, and vice versa sometimes occurs, are summarized.