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Fig. 2. Timing of phosphorescence image acquisition. The curve shows the exponential decay of phosphorescence intensity It after an excitation flash at time t=0. The image intensifier is turned on at delay time td for the gate period {Delta}T. The grey-shaded area indicates that portion of phosphorescence light (Z) that is integrated on the CCD array during {Delta}T. I0, initial phosphorescence intensity immediately after the excitation flash.





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