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  • 1
    Electronic Resource
    Electronic Resource
    Luminescence in Porous Silicon—Surface vs. Bulk (2000)
    Springer
    Journal of porous materials 7 (2000), S. 283-286 
    Details
    ISSN: 1573-4854
    Keywords: porous Si ; luminescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The mechanism of luminescence in porous silicon still remains poorly understood. The main point of controversy is whether the luminescence is due to recombination in the quantum size structures that constitute porous silicon or whether it is dominated by surface recombination. In this paper, we present evidence that emphasises the role that surface recombination plays in the luminescence of porous silicon. In this framework, we also attempt to reconcile the resonant luminescence data (which argues for “ bulk” recombination) with our results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009688232248
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  • 2
    Electronic Resource
    Electronic Resource
    Correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions (2000)
    Springer
    EPJ direct 1 (2000), S. 1-67 
    Details
    ISSN: 1435-3725
    Keywords: 12.38.-t ; 13.85.-t ; 13.87.Ce ; 13.87.Fh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a study of correlations between D and $${\overline D}$$ mesons produced in 500 GeV/cπ−-nucleon interactions, based on data from experiment E791 at Fermilab. We have fully reconstructed 791 ± 44 charm meson pairs to study correlations between the transverse and longitudinal momenta of the two D mesons and the relative production rates for different types of D meson pairs. We see slight correlations between the longitudinal momenta of the D and the $${\bar D}$$ , and significant correlations between the azimuthal angle of the D and the $${\bar D}$$ . The experimental distributions are compared to a next-to-leading-order QCD calculation and to predictions of the PYTHIA/JETSET Monte Carlo event generator. We observe less correlation between transverse momenta and different correlations between longitudinal momenta than these models predict for the default values of the model parameters. Better agreement between data and theory might be achieved by tuning the model parameters or by adding higher order perturbative terms, thus contributing to a better understanding of charm production. The relative production rates for the four sets of charm pairs, $$D^0{{\overline D}^0}, D^0 D^{-}, D^+{{\overline D}^0}, D^+ D^{-}$$ as calculated in the PYTHIA/JETSET event generator with the default parameters, agree with data as far as the relative ordering, but predict too many $$D^+ {{\overline D}^0}$$ pairs and too few $$D^+ D^{-}$$ pairs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s101059900c0004
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    Paper (German National Licenses)
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