The electron-paramagnetic-resonance spectra of the systems CaF 2 : 151 Eu 2+ , Srl ? 2: 151 Eu 2+ , BaF 2 : 151 Eu 2+ have been studied at a pressure of 26 kbar. These spectra were interpreted in terms of the usual phenomenological spin Hamiltonian with parameters g (spectroscopic splitting factor), h and #6 (crystalline-field parameters), and A (hyperfine splitting factor). The variations of & 4 and h with pressure were compared with their variations with cation, and a consistent interpretation of the differences was found in terms of local lattice distortions about the impurity europium ions. This model leads to the relationships ft^S -8 -8 , b%^5~1 3 -6 between the crystalline-field parameters and the nearest-neighbor distance 8.

Use of ultrasound for metal cluster engineering in ion implanted silicon oxide Appl. Phys. Lett. 90, 013118 (2007); Electron cyclotron resonance ion source for high currents of mono-and multicharged ion and general purpose unlimited lifetime application on implantation devices Rev. Sci. Instrum. 71, 899 (2000)

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