FINE-STRUCTURE OF OPTICAL-ABSORPTION SPECTRA IN CRF2

The optical absorption spectra in CrF2 are investigated by diagonalizi ng the Hamiltonian matrix for 3d(4) and 3d(6) ions at orthorhombic sym metry sites. These matrices including the electrostatic, crystal-held and spin-orbit interactions as well as Trees' correction are useful fo r investigation of the fine structure of optical absorption spectra as well as the zero-field splittings of the orbital ground state. Some f ine-structure energy levels of Cr2+ in CrF2 not assigned earlier are n ow assigned. The contribution of the spin triplets to the splittings o f the orbital ground state is considered and found to be important.