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  • 1
    Electronic Resource
    Electronic Resource
    Exciton migration in a "pseudo''-one-dimensional crystal: Luminescence dynamics of doped CsMnBr3 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1768-1774 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The exciton migration in CsMnBr3 (CMB), a linear chain salt which acts as a "pseudo''-one-dimensional antiferromagnet, has been probed by examining the time-resolved luminescence of doped crystals. A number of metal ions such as Cr2+, Cr3+, Fe2+, Cu2+, Mo3+, Er3+ were observed to behave as exciton traps, while Cd2+ and Mg2+ act as exciton scatterers (antitraps). Samples doped with traps and traps along with scatterers, as well as "dilute'' CsMnx[Mg2+ or Cd2+ ]1−xBr3 crystals were investigated. Analysis of the data indicates that exciton migration between chains is significant with a room temperature hopping frequency of 107–108 s−1 and a thermal barrier of 500 cm−1. The barrier for intrachain migration appears to be somewhat smaller, between 350 and 400 cm−1. Only at temperatures below 60 K does the exciton migration seem to be strictly confined to one dimension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458058
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  • 2
    Electronic Resource
    Electronic Resource
    Emission dynamics from doped crystals of (CH3)4NMnBr3(TMMB)-exciton trapping in a one-dimensional lattice (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6442-6448 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The red emission from (CH3)4NMnBr3 (TMMB) crystals is quenched by small concentrations of Cu2+. The emission decay curves from TMMB crystals doped with Cu2+ deviate dramatically from simple exponential form. Consistent with the linear chain structure of TMMB, the decay curves are accurately described by expressions derived to treat exciton trapping in a one-dimensional lattice. The analysis of the data indicate that the intrachain exciton migration is rapid, with a hopping frequency at room temperature of 1011 to 1012 s−1. The temperature dependence of the emission decay curves is consistent with an energy barrier to migration of 600 to 700 cm−1. Interchain migration apparently makes a negligible contribution to exciton trapping in TMMB with the interchain hopping frequency estimated to be less than 102 s−1. Within the limits of the experimental data, energy transport in TMMB is perfectly one-dimensional.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451849
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Energy levels and optical properties of neodymium-doped barium fluorapatite (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1935-1942 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Energy levels of the 4f3 electronic configuration of Nd3+ in barium fluorapatite, Ba5(PO4)3F(B-FAP) have been determined from polarized absorption and fluorescence spectra using crystals at 8 K. Experimental energy-level assignments were made initially by comparing the crystal spectra energy levels with those obtained from those previously reported for Nd3+ in strontium fluorapatite and fluorapatite. The initial crystal-field parameters were calculated by using lattice summation techniques. The crystal-field parameters were varied to obtain a best fit between experimental and theoretical energies and the final values give a root-mean-square deviation of 7.1 cm−1. The odd-fold crystal-field components are used to calculate the emission intensities and lifetimes of the Nd3+ ions in B-FAP. These calculations yield results in good agreement with the experimental measurements of the absorption and emission cross sections and lifetimes. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1305550
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    Paper (German National Licenses)
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