Measurements of Absolute Quenching Cross Sections

In Sect. 6.3 we saw that the effective lifetime of an excited level k) of an 

Several possible decay channels contribute to the depopulation of level k), and the quenching cross section can be written as the sum 

While measurements of the effective lifetime yield absolute values of 

While measurements of the effective lifetime r (Ng) yields absolute values of the total quenching cross section the different contributions 

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