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Article Dans Une Revue Applied Surface Science Année : 1996

Analytic treatment of charge cloud overlaps: An improvement of the tomographic atom probe efficiency

P. Bas
  • Fonction : Auteur
G. Grancher
  • Fonction : Auteur
Bernard Deconihout
D. Blavette

Résumé

Although reliable position and composition data are obtained with the Tomographic Atom Probe, the procedure of position calculation by charge centroiding fails when the detector receives two or more ions with close spaced positions and the same mass-to-charge ratio. As the charge clouds of the ions overlap, they form a unique charge pattern on the multianode detector. Only one atom is represented and its position is biased. In order to estimate real positions, we have developed a correction method. The spatial distribution of charges inside a cloud issued from one impact is modelled by a Gaussian law. The particular properties of the Gaussian enable the calculation of exact positions of the two impacts of the overlapped charge patterns and charges of corresponding clouds. The calculation may be generalized for more than two overlapped clouds. The method was tested on a plane-by-plane analysis of a fully ordered Cu3Au alloy performed on a (100) pole.

Dates et versions

hal-01928951 , version 1 (20-11-2018)

Identifiants

Citer

P. Bas, A. Bostel, G. Grancher, Bernard Deconihout, D. Blavette. Analytic treatment of charge cloud overlaps: An improvement of the tomographic atom probe efficiency. Applied Surface Science, 1996, 94-95, pp.442--448. ⟨10.1016/0169-4332(95)00408-4⟩. ⟨hal-01928951⟩
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