Accession Number : AD0779872

Title :   Zero-Field Paramagnetic Resonance of Trivalent Gadolinium in Several Lanthanon Tris(Ethylsulfate) Nonahydrates and Nonadeuterates--Determination of Crystal Field and Hyperfine Structure Parameters.

Descriptive Note : Technical rept. 1 Jun-30 Nov 74,

Corporate Author : PRINCETON UNIV N J

Personal Author(s) : Bernstein,E. R. ; Dobbs,G. M.

Report Date : 01 JUN 1974

Pagination or Media Count : 82

Abstract : Employing isotopically pure trivalent 155Gd, 157Gd, and 160Gd as guests in dilute mixed crystals of lanthanum tris(ethylsulfate) nonahydrate (La3(C2H5SO4)3.9H2O), it has been possible to determine both accurate zero-field splitting parameters of crystal field origin and hyperfine structure constants due to magnetic dipole and electric quadrupole interaction terms. The zero-field paramagnetic resonance spectroscopic method is used. It is reasoned that the quadrupole hyperfine constant is due, almost entirely, to lattice contributions; moreover, it is shown to be of the expected order of magnitude and sign. The hyperfine anomaly is discussed. A set of crystal field parameters are reported for the first time for 160Gd in crystals of La(C2H5SC4)3.9D2O which differ significantly from those of the hydrate. Variations of crystal field parameters with various lanthanon host ions are also observed. Finally, a few comments concerning zero-field line widths and their measurement are made. (Modified author abstract)

Descriptors :   *Electron paramagnetic resonance, *Gadolinium, Atomic energy levels, Hyperfine structure, Crystals, Magnetic dipoles, Lanthanum compounds, Quadrupole moment, Deuterium compounds

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE