 Solution

ID: past-exam-of-the-chemistry-course-of-the-year-3-of-the-natural-sciences-course-of-the-university-of-cambridge/2022/paper-2a/section-a/15/c/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 / 2022 / Paper 2A / Section A / 15 / c / ii / Solution by

Codex  0 2026-10-20

Now

Δ_{o} / B = 40

and the ground term is

^{2} T_{2 g}

. Spin-conserving transitions to the labelled doublet excited terms are possible. Reading the diagram gives approximately

upper term^{2} A_{2 g},^{2} T_{1 g}^{2} E_{g}^{2} A_{1 g} E / B 354152 ν / c m^{- 1} 2.8 \times 1 0^{4} 3.3 \times 1 0^{4} 4.2 \times 1 0^{4}

(1)

The first two upper terms are coincident or unresolved at this diagram's resolution. These doublet transitions should dominate over the spin-forbidden transitions to sextet or quartet levels. Their intensity still depends on vibronic or other relaxation of the Laporte rule. The plotted curves justify only approximate wavenumbers, not several-digit band positions.

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