Abstract
The kinetics of the quenching process have been studied for two efficient solvents, monoisopropybiphenyl and toluene, over a range of solute concentrations. It was found that the Stern-Volmer relationship was applicable and quenching constants were obtained for carbon tetrachloride, diphenyl mercury and lead-2-ethyl hexanoate in each solvent. The quenching constants were significantly lower in monoisopropylbiphenyl than in toluene. A kinetic scheme for the probable steps in the energy transfer process was formulated, and by the application of steady-state kinetics several experimentally verifiable postulates were obtained. These were tested and confirmed by the experimental data obtained from the variation of quencher constants with solute concentrations. Some useful observations relating to the optimum formulation of loaded liquid scintillators in nuclear radiation detectors can also be made from the results.
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