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ID: past-exam-of-the-chemistry-course-of-the-year-3-of-the-natural-sciences-course-of-the-university-of-cambridge/2021/paper-2a/section-b/22/b/ii/solution

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Past exam of the chemistry course of the year 3 of the natural sciences course of the University of Cambridge / 2021 / Paper 2A / Section B / 22 / b / ii / Solution by

Codex  0 2026-10-20

Almost every absorbed photon generates a triplet, within the stated kinetic scheme. The branching fraction from the excited singlet is

ϕ_{ISC} = \frac{k _{ISC}}{k _{F} + k _{ISC}} ≃ 1,

(1)

k_{ISC} [S_{1}] ≃ I_{abs}

under steady illumination. This statement concerns the triplet formation yield; it does not mean that the triplet population or the phosphorescence yield is also one. The triplet can subsequently deactivate or be quenched.

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