期刊
MICROSCOPY AND MICROANALYSIS
卷 21, 期 6, 页码 1649-1656出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927615015184
关键词
atom probe tomography; meshless simulation; Robin's equation; Barnes-Hut algorithm; point charge model
资金
- French Agence Nationale de la Recherche (ANR) [ANR-12-NANO-0001]
- Agence Nationale de la Recherche (ANR) [ANR-12-NANO-0001] Funding Source: Agence Nationale de la Recherche (ANR)
An alternative approach for simulating the field evaporation process in atom probe tomography is presented. The model uses the electrostatic Robin's equation to directly calculate charge distribution over the tip apex conducting surface, without the need for a supporting mesh. The partial ionization state of the surface atoms is at the core of the method. Indeed, each surface atom is considered as a point charge, which is representative of its evaporation probability. The computational efficiency is ensured by an adapted version of the Barnes-Hut N-body problem algorithm. Standard desorption maps for cubic structures are presented in order to demonstrate the effectiveness of the method.
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