Question Bank › Inorganic Chemistry › Coordination Chemistry › ABC26IN0137The allowed electronic transition in fluorine molecule is · ABC26IN0137 Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Exam: CSIR NET 2018 · Marks: 2 · Difficulty: Medium
The allowed electronic transition in fluorine molecule is
(a) $\Sigma_{g}^{+} \rightarrow \Sigma_{g}^{+}$
(b) $\Sigma_{g}^{+} \rightarrow \Sigma_{g}^{+}$
(c) $\Sigma_{g}^{+} \rightarrow \pi_{\mathrm{u}}$
(d) $\Sigma_{g}^{+} \rightarrow \Delta_{\mathrm{u}}$
Answer Answer: C ✓ checked by 4AB · confidence high
Explanation The allowed transitions need g ↔ u, ΔΛ = 0, ±1 and ΔS = 0. From the ¹Σg⁺ ground state of F₂, only ¹Σg⁺ → ¹Πu (π*g → σ*u) satisfies all three (option 3).
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