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Träfflista för sökning "WFRF:(Migliorati M.) "

Search: WFRF:(Migliorati M.)

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1.
  • Ferrari, Piero, et al. (author)
  • The effect of radiative cooling on the size-dependent stability of small boron clusters
  • 2018
  • In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947. ; 98
  • Journal article (peer-reviewed)abstract
    • The mass spectrum of cationic boron clusters, BN+ (N = 5 − 20), after photoexcitation demonstrates that radiative cooling is an important, though often neglected, process in determining the relative stability of small and isolated particles. The observed intensities inmass spectra suggest that B5+, B11+, B13+, and B15+ are particularly stable clusters, consistent with density-functional theory calculations. Quantitative agreement, however, is only obtained if radiative cooling is included in the analysis.All clusters are found to radiate onmicrosecond timescales, suggesting recurrent fluorescence as the dominant photon emission process.
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2.
  • Paskova, Tanja, et al. (author)
  • Mass transport growth and optical emission properties of hydride vapor phase epitaxy GaN
  • 2001
  • In: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 78:26, s. 4130-4132
  • Journal article (peer-reviewed)abstract
    • The optical emission properties of mass-transport regions of GaN grown by hydride vapor phase epitaxy are studied by cathodoluminescence imaging and spectroscopy. A strong donor-acceptor pair emission is observed from the mass-transport regions. Spatially resolved cathodoluminescence reveals a strong intensity contrast between the exciton and donor-acceptor bands from mass-transport and nontransport regions. Focused Auger electron and x-ray photoelectron spectroscopies were employed to investigate the impurity incorporation in the different regions. A preferential moderate increase of residual impurity incorporation or redistribution in mass-transport regions is suggested to be responsible for the observed change of the dominant radiative mechanism. © 2001 American Institute of Physics.
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