Regensburg 2000 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 38: Postersitzung
DS 38.55: Poster
Dienstag, 28. März 2000, 09:30–17:30, Poster B
Crystal-GRID: What can we learn about interatomic solid state potentials? — •Timo Hauschild1,2,3, Michael Jentschel1, Hans G. Börner1, Karl-Heinz Heinig2, and Wolfhard Möller2,3 — 1Institut Laue-Langevin (ILL), Nuclear and Particle Physics Group, F-38000 Grenoble — 2Forschungszentrum Rossendorf (FZR), Institut für Ionenstrahlphysik und Materialforschung, 01314 Dresden — 3TU Dresden, 01062 Dresden
Crystal-GRID is a new and complementary method for studying interatomic solid state potentials in the energy range 1 eV to 1 keV. Due to a neutron capture induced photon emission an atom of the crystal starts moving with an energy of some hundreds of eV. Information on the movement of this nuclear probe can be read out by measuring the Doppler shift of a second in-flight emitted photon. The amount of information depends strongly on the nuclear level lifetime in between the two photon emissions and on the interatomic interaction. Systematic theoretical investigations will be presented showing under which requirements, e.g. for count rates or lifetimes, interatomic potentials can be investigated. Experimental results for ZnS and TiO2 will be presented. In these cases it was possible to simultaneously extract the nuclear level lifetime and the screening length of the screened Coulomb potential.