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17 Avril 2012 - D. Haley - Morphological evolution of specimen shape in Atom Probe Tomography

par LABGPM - publié le

Mardi 17 Avril 2012

Daniel Haley - Oxford University

Morphological evolution of specimen shape in Atom Probe Tomography

Abstract

Atom probe tomography is a technique for atomic scale characterisation of both atom mass and position, in which specimens on the nanometre scale are used to generate point projections of the atomic surface onto a 2D detector.

Whilst functioning as a 2D positioning mass spectrometer, the atom probe performs exceedingly well at this task. Extensions into 3D shape are inferred from the detector sequence, and are currently performed using simple, static assumptions of tip shape to perform computational 3D atomic placement, known as "reconstruction".

Recently it has been identified that in many cases, these assumptions have been identified as a limiting factor in the reconstruction procedure, thus necessitating greater study of the effect of tip morphology, and how the shape change prediction can be coupled to the reconstruction procedure.