IGNOU MCH 11 2026 2027 - What are Racah parameters? What do they signify? The gas-phase ion V3+

Question

What are Racah parameters? What do they signify? The gas-phase ion V3+ has a 3F ground term. The 1D and 3P terms lie, respectively, 10,642 and 12,920 cm-1 above it. The energies of the terms are given in terms of Racah parameters as E(
3F) = A=8B, E( 3P)=A+7B, E( 1D) = A-3B+2C. Calculate the values of B and C for V 3+

17 Jul 2026

Answer :

Word Count : 239

Racah parameters are empirical interelectronic repulsion parameters introduced by Giulio Racah to describe the energy differences between electronic terms arising from electron–electron interactions in partially filled d and f orbitals. They are represented by the symbols A, B, and C. The parameter A corresponds to the average electron-electron repulsion energy

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