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) =

05 Aug 2026

Answer :

Word Count : 440

Racah parameters are a set of parameters used to describe the energies of the electronic terms of transition-metal ions, particularly those having more than one d electron. They provide a convenient way of expressing the interelectronic repulsion between d electrons. The three important Racah parameters are A, B and C. The parameter A represents the average energy of interelectronic repulsion and is common to all terms arising from a particular electron configuration. Therefore, differences in term energies are independent of A. Parameters B and C describe the differential interelectronic repulsion and are related to the distribution of electrons among the different d orbitals. For a free ion, the values of B and C are determined by the Coulombic repulsion between electrons. B is especially important because it measures the separation between different terms of the same

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