Accession Number : AD0460398


Title :   ELECTRON PARAMAGNETIC RESONANCE OF ERBIUM AND DYSPROSIUM IN CUBIC CRYSTALS.


Descriptive Note : Technical rept.,


Corporate Author : STANFORD UNIV CA STANFORD ELECTRONICS LABS


Personal Author(s) : Chang, I-C


Report Date : Jan 1965


Pagination or Media Count : 133


Abstract : An investigation of the gamma sub 8 quartets of rare earth ions was made by studying their electron paramagnetic resonance in selected cubic crystals. The theory of EPR for gamma sub 8 quartets was developed using an effective hamiltonian. Numerical calculations were made. Electron paramagnetic resonance measurements were for Er(3+) in MgO, CaO and SrO crystals and Cy(3+) in CaF2 and SrF2 crystals. For all these crystals the gamma sub 8 quartets have been observed. The corresponding crystalline field parameters were determined. The results could be explained by a modified point charge model. Measurements of spin-lattice relaxation time were made for Er(3+) in CaO. The results checked qualitatively with theoretical calculations. Considering the present status of crystal-growing technology, the change of a gamma sub 8 is not promising. The main reasons are: (1) the presence of various axial field spectra due to change compensation processes, and (2) line broadening due to crystal inperfections. (Author)


Descriptors :   *DYSPROSIUM COMPOUNDS , *ERBIUM COMPOUNDS , ELECTRON OPTICS , CRYSTAL GROWTH , GROUND STATE , RELAXATION TIME , OXIDES , GROUPS(MATHEMATICS)


Distribution Statement : APPROVED FOR PUBLIC RELEASE