Accession Number : AD0628401

Title :   THE GROUND STATES AND RELATIVE STARK SPLITTINGS OF SOME TRIVALENT RARE EARTH IONS IN THE CUBIC CRYSTAL FIELD OF CALCIUM FLUORIDE,

Corporate Author : SOREQ RESEARCH ESTABLISHMENT ISRAEL ATOMIC ENERGY COMMISSION YAVNEH

Personal Author(s) : Ranon,U.

Report Date : MAY 1964

Pagination or Media Count : 26

Abstract : The ratios B4/B6 of the cubic crystal field parameters are calculated from electron spin resonance on CaF2;Nd(3+) and CaF2;Dy(3+), and the results are used to show that the ratio A4/A6 is not constant, as required by the point charge model. A linear expression of A4/A6 as a function of Z is constructed from the available data. The integrals <r4> and <r6> of Freeman and Watson are used in deducing Br/B6 for the trivalent rare earth ions. Eigenfunctions and eigenvalues of Lea, Leask and Wolf are employed in deducing the ground states and relative Stark splittings of the rare earth ions. The ground states are: Pr(3+)(gamma-5); Nd(3+)(gamma-8); Pm(3+)(gamma-1); Tb(3+)(gamma-3); Dy(3+)(Gamma-8); Ho(3+)(gamma-3); Er(3+)(gamma-7); Tm(3+)(gamma-2); Yb(3+)(gamma-7). Optical spectra are discussed. (Author)

Descriptors :   (*RARE EARTH ELEMENTS, ATOMIC ENERGY), (*CALCIUM COMPOUNDS, FLUORIDES), (*ATOMIC, RARE EARTH ELEMENTS), (*STARK EFFECT, RARE EARTH ELEMENTS), CRYSTAL LATTICES, IMPURITIES, ELECTRON PARAMAGNETIC RESONANCE, PRASEODYMIUM, NEODYMIUM, PROMETHIUM, TERBIUM, PYSPROSIUM, HOLMIUM, ERBIUM, THULIUM, YTTERBIUM, ISRAEL

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE