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Quenching of Fluorescence in I2

Quenching of Fluorescence in I2

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Question:

Consider the quenching of fluorescence in I2. The fluorescence intensity, If from the excited level (ν=25, J=34) is measured as a function of helium concentration relative to its value, If0 in the absence of helium. From equation 7.21 [1],

we note that at zero quencher pressure,

so that

where kq corresponds to the sum of all processes leading to the depopulation of the initially excited level. A table of results is given below. Determine kq given that kf is 1.4 × 106 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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