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Träfflista för sökning "WFRF:(Leigh J.) srt2:(2000-2004)"

Sökning: WFRF:(Leigh J.) > (2000-2004)

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  • Leigh, R. S., et al. (författare)
  • Vibrational modes of sulfur defects in GaP
  • 2003
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 68:3
  • Tidskriftsartikel (refereegranskat)abstract
    • First principles calculations carried out on GaP containing sulfur donors 32SP (95%) and34SP (5%) show that both the neutral and ionized donors are located on substitutional sites and have weak S-Ga bonds. For the sulfur impurity in its positive charge state the calculations give gap modes for 32S and34S at frequencies close to those found experimentally. Modes within the gap are also predicted for neutral sulfur at frequencies within a few cm-1 of their charged-state counterparts. However, the SP0 donor has a very low apparent charge (i.e. oscillator strength), its calculated integrated absorption cross section being only ∼3% of that for the SP+ defect. These results support an earlier explanation of the failure to detect gap modes from SP0 in infrared measurements. Calculated and observed apparent charges for the SP+ donor are compared, and the importance of taking due account of the different geometries that apply to the theoretical calculations and infrared experiments is emphasized.
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3.
  • Kelly, M. M., et al. (författare)
  • Analysis of fluid-phase mediators
  • 2002
  • Ingår i: The European respiratory journal. Supplement. - : European Respiratory Society (ERS). - 0904-1850. ; 37, s. 24s-39s
  • Tidskriftsartikel (refereegranskat)
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