Martin Tomas L, London Andrew J, Jenkins Benjamin, Hopkin Sarah E, Douglas James O, Styman Paul D, Bagot Paul A J, Moody Michael P
1Department of Materials,University of Oxford,Parks Road,Oxford,OX1 3PH,UK.
2National Nuclear Laboratory,Building D5,Culham Science Centre,Abingdon,Oxfordshire,OX14 3DB,UK.
Microsc Microanal. 2017 Apr;23(2):227-237. doi: 10.1017/S1431927617000356.
The local electrode atom probe (LEAP) has become the primary instrument used for atom probe tomography measurements. Recent advances in detector and laser design, together with updated hit detection algorithms, have been incorporated into the latest LEAP 5000 instrument, but the implications of these changes on measurements, particularly the size and chemistry of small clusters and elemental segregations, have not been explored. In this study, we compare data sets from a variety of materials with small-scale chemical heterogeneity using both a LEAP 3000 instrument with 37% detector efficiency and a 532-nm green laser and a new LEAP 5000 instrument with a manufacturer estimated increase to 52% detector efficiency, and a 355-nm ultraviolet laser. In general, it was found that the number of atoms within small clusters or surface segregation increased in the LEAP 5000, as would be expected by the reported increase in detector efficiency from the LEAP 3000 architecture, but subtle differences in chemistry were observed which are attributed to changes in the way multiple hit detection is calculated using the LEAP 5000.
局部电极原子探针（LEAP）已成为用于原子探针断层扫描测量的主要仪器。探测器和激光设计的最新进展，以及更新的命中检测算法，已被纳入最新的LEAP 5000仪器中，但这些变化对测量的影响，特别是对小团簇的尺寸和化学性质以及元素偏析的影响，尚未得到研究。在本研究中，我们使用探测器效率为37%的LEAP 3000仪器和532纳米绿色激光，以及制造商估计探测器效率提高到52%的新型LEAP 5000仪器和355纳米紫外激光，比较了来自各种具有小规模化学不均匀性材料的数据集。总体而言，发现LEAP 5000中小团簇或表面偏析内的原子数量增加，这与LEAP 3000架构中报告的探测器效率提高预期一致，但观察到化学性质存在细微差异，这归因于使用LEAP 5000计算多重命中检测的方式发生了变化。
