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quinine. GlVe your reasoning and suggest its origin. The rise time of the PMT is about 2.2 ns (the rise time is the time for the PMT signal to go from 10 to 90% of its final value), the laser pulse width is < 3 ns and the sampling rate of the oscilloscope is 4 gigasamples/sec. What is the shortest fluorescence decay time you will be able to measure directly? Show how you calculate or estimate this. Suggest ways you can improve upon this. 6)

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