Chapter 11, Problem 11E.1E

Interpretation Introduction

Interpretation:

Excited singlet state or excited triplet state is whether the most likely precursor of the photochemical reaction has to be determined.

Concept Introduction:

In fluorescence, the radiation that is emitted spontaneously ceases as soon as the (within nanoseconds) the exciting radiation gets extinguished.

In phosphorescence, an intersystem crossing to a triplet state takes place and hence the radiation that is emitted spontaneously will persist for more time.

Lifetime of a given unimolecular photochemical reaction can be determined using the given formula.

  $\begin{array}{c}\tau \text{ = }\frac{1}{k_f}\\ \\ where,\\ k_f\text{ = Rate constant}\end{array}$