Münster 1999 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 35: Ionenimplantation

HL 35.2: Vortrag

Donnerstag, 25. März 1999, 18:00–18:15, H2

Potential investigation for ZnS using Crystal-GRID high-precision γ spectroscopy and MD computer simulations — •Timo Hauschild^1,2, Karl-Heinz Heinig¹, Michael Jentschel², and Hans G. Börner² — ¹Forschungszentrum Rossendorf (FZR), Institut für Ionenstrahlphysik und Materialforschung, D-01314 Dresden — ²Institut Laue-Langevin (ILL), Nuclear and Fundamental Physics group, F-38000 Grenoble

Crystal-GRID is a new and complementary method for studying interatomic potentials in crystals at intermediate energies between 1 eV and 1 keV. After a neutron capture reaction a first photon emission leads to a recoil of the still excited nucleus. While moving through the crystal a second photon is emitted. When observing many recoil events a structured and Doppler broadened γ line shape is obtained due to the anisotropic slowing down in the crystal. Experimental findings from the high-precision gamma spectrometers GAMS 4 and GAMS 5 at the ILL are compared to predictions from molecular dynamics (MD) simulations. Thereby information about the interatomic potential can be obtained. Results will be presented for ZnS single crystals, showing that the universal screened Coulomb potentials (ZBL, KrC) are not appropriate in the examined energy region. A new potential for that region will be presented.