Accession Number : AD0711063

Title :   ENERGY TRANSFER IN SOLIDS.

Descriptive Note : Final technical rept. 25 Feb 69-25 May 70,

Corporate Author : ALABAMA UNIV HUNTSVILLE RESEARCH INST

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

Report Date : JUL 1970

Pagination or Media Count : 28

Abstract : A summary is given of the results of research directed largely to an increased understanding of cooperative phenomena observed to occur between simpurity (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. A subsidiary effort has been directed towards the understanding of the scattering mechanism responsible for the production of an emission continuum when materials typically used for infrared windows (and solid state laser host materials) are illuminated by intense monochromatic light. (Author)

Descriptors :   (*RARE EARTH ELEMENTS, *ELECTRON TRANSITIONS), (*INFRARED WINDOWS, *DEGRADATION), (*HOLMIUM, ELECTRON TRANSITIONS), (*PRASEODYMIUM, ELECTRON TRANSITIONS), (*NEODYMIUM, ELECTRON TRANSITIONS), (*FLUORESCENCE, RARE EARTH ELEMENTS), DOPING, IMPURITIES, CRYSTAL DEFECTS, LANTHANUM COMPOUNDS, CHLORIDES, MOLECULAR ORBITALS, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE