**Question:**

**Consider the quenching of fluorescence in I _{2}. The fluorescence intensity, I_{f} from the excited level (ν=25, J=34) is measured as a function of helium concentration relative to its value, I_{f}^{0} in the absence of helium. From equation 7.21 [1],**

**we note that at zero quencher pressure,**

**so that**

**where k _{q} corresponds to the sum of all processes leading to the depopulation of the initially excited level. A table of results is given below. Determine k_{q} given that k_{f} is 1.4 × 10^{6} s^{-1}.**

**This is the problem 7.14 of the book "Chemical Kinetics and Reaction Dynamics, written by Paul L. Houston".**

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