Accession Number : AD0719717

Title :   Intrinsic Studies of Materials.

Descriptive Note : Final technical rept. 19 Jun 67-31 Aug 70,

Corporate Author : ALABAMA UNIV HUNTSVILLE RESEARCH INST

Personal Author(s) : Porter,John F. , Jr

Report Date : JAN 1971

Pagination or Media Count : 29

Abstract : The primary effort of this contract has been directed largely to an increased understanding of cooperative phenomena observed to occur between impurity (dopant) ions in ionic crystals. The phenomena observed were (a) ion pair absorption in LaCl3 by Ho(3+) + Nd(3+), by Ho(3+) + Pr(3+), and by Pr(3+) + Nd(3+), in which case one photon is absorbed by two ions; (b) satellite structure in which case the perturbation caused by the mutual interaction of neighboring ions produces a shift and splitting of the energy levels relative to the single Ho(3+) ion levels; (c) multiple ion relaxation processes in Ho(3+) doped LaCl3, in which case the excitation energy of a single ion is shared (nonradiatively) with one or more ions in the decay process. (Author)

Descriptors :   (*RELAXATION TIME, CRYSTAL LATTICES), (*RARE EARTH ELEMENTS, *ELECTRON TRANSITIONS), (*CRYSTAL DEFECTS, INTERACTIONS), EXCITATION, DOPING, LANTHANUM COMPOUNDS, PHONONS, ATOMIC ENERGY LEVELS, HOLMIUM, CHLORIDES, PRASEODYMIUM

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE