Abstract
The optical absorption spectra in CrF 2 are investigated by diagonalizing the Hamiltonian matrix for 3d 4 and 3d 6 ions at orthorhombic symmetry sites. These matrices including the electrostatic, crystal-field and spin-orbit interactions as well as Trees' correction are useful for investigation of the fine structure of optical absorption spectra as well as the zero-field splittings of the orbital ground state. Some fine-structure energy levels of Cr 2+ in CrF 2 not assigned earlier are now assigned. The contribution of the spin triplets to the splittings of the orbital ground state is considered and found to be important.
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