Abstract
Energy levels of n d transition metal ions in a ligand field of the tetragonal symmetry are studied in the strong field approximation. In this field, d level is split into four sub-levels differing in energy, of symmetry b 1 , a 1 , e and b 2 respectively. Starting from the configurations containing these orbitals, Coulomb interaction between electrons is introduced, which gives rise to energy levels, each characterized by \(S\varGamma\). Matrix elements of Coulomb interaction are expressed in terms of Racah's parameters A , B and C with the ligand field parameters X , Y and Z which give the intervals between orbital energies. These matrix elements are shown for d 2 , d 3 , d 4 and d 5 .
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