Yazar "Hole D.E." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Influence of pulsed laser annealing on rare earth implanted luminescence
    (Elsevier, 1996) Can N.; Townsend P.D.; Hole D.E.; Ballesteros J.M.; Afonso C.N.; Snelling H.V.
    Sapphire (Al2O3) and silica samples have been implanted with 400 keV Eu ions at fluences up to 1 X 1016 ions · cm-2. After the samples implanted with Eu ions had been annealed with pulsed excimer lasers it was found that cathodoluminescence (CL) emission intensity of the implanted europium ions was considerably enhanced (i.e. by factors of up to 100 for sapphire and silica at the dose of 1 X 1016 ions · cm-2). Results from furnace annealing of Eu implanted samples, followed by pulsed excimer laser annealing are compared, and the future potential of the method is discussed. The lifetimes range from 6 to about 16 ms and from 0.14 to 1.6 ms for the silica and sapphire samples, respectively, depending on annealing treatment and Eu concentration. Rutherford backscattering spectrometry (RBS) did not show measurable diffusion for the implanted ions.
  • Küçük Resim Yok
    Öğe
    Ion beam analysis of float glass surface composition
    (Elsevier, 1997) Lamouroux F.; Can N.; Townsend P.D.; Farmery B.W.; Hole D.E.
    Data are reported on ion beam surface analysis methods of proton-induced X-ray emission (PIXE), and helium-induced X-ray emission (HIXE), made simultaneously with Rutherford backscattering spectrometry (RBS), which were taken with samples from across the full width of a float glass production line. Data are given for both clear and green glass. Significant variations are recorded between signals from the lower surface, (the face in contact with tin), and the upper surface, not only for the uptake of the tin, but also for the consequent changes in the near surface composition of the other main elements of the glass. In particular, the tin alters the local compositions of iron, calcium, silicon, and sodium. The changes are interpreted in terms of the furnace temperature gradients and chemical interactions. In all cases, including the green glass, iron is depleted from the non-tin face relative to the bulk composition, and the changes of surface content of the iron differs on the two faces relative to the bulk value.