Abstract
The fluorescence of pure liquid mesitylene at -50°C is investigated as function of excitation energy in the range 4.5–21 eV when the open surface of the liquid is excited. The normalized intensity is constant for excitation in the first two electronic absorption bands and increases significantly for excitation in the third absorption band. This increase in fluorescent quantum yield is explained as a result of reduced non-radiative transitions due to a decrease in the van der Waals interactions between the molecules at the surface of the liquid, and also by a decrease in the efficiency of excimer formation there. With increasing energy of the exciting photon photoelectrons are released which produce secondary excitations and hence cause the observed increase in fluorescent yield.
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Schedule a callMore From: International Journal of Radiation Applications & Instrumentation. Part C, Radiation Physics & Chemistry
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