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In this short article only the case of point, single color FCS with a confocal set up will be examined... be monitored whereas in ~µs range processes like singlet-triplet kinetics, photo-isomerization and proton... anifested in the auto-correlation function is the singlet-triplet kinetics. Triplet states are "dark" in t... housands times, cycling between the first excited singlet state S1 and the ground state S0. With a certain