Temperature and host dependence of the transition interference between f–f and f–d transitions of Sm2+ in matlockites

摘要: Abstract The absorption spectra of Sm2+ doped in MFX (M=Sr, Ba; X=Cl, Br) crystals were studied within the range 20,000–35,000 cm−1 as a function temperature and host. bands observed described with simple model developed by Wood Kaiser using group theory. host dependence on 7F0→5D3 Fano resonance lines investigated. BaFCl:Sm2+ system showed “normal” transition at 4 K spite similar crystal structure profile other hosts. New resonances higher energies (23,000–25,000 cm−1) for all MFX:Sm2+ systems which persist up to room temperature. Preliminary energy level calculation that these involve interaction between excited 5LJ states 4f6 configuration 4f55d1 configuration.