论文标题
田间解吸图中增强区线的起源
Origin of Enhanced Zone Lines in Field Desorption Maps
论文作者
论文摘要
探测器命中的集体解吸图中的伪影阻止了真实的重建，包括增强的“区域线”，具有高原子冲击强度。由于APT具有破坏性，因此模拟是解释这些区域线的起源的唯一方法，但以前的工作无法复制它们。在这里，我们使用一种新的仿真技术，该技术将完整的静电力添加到分子动力学模拟中，并消除了先前的临时假设。我们发现，在钨的规范示例中，当静电力超过原子间力时发生蒸发，而两种力的未对准使原子在某些区域中的发射方向偏离，从而引起了围绕区域线的命中事件的积累。
Artifacts in the collective desorption map of the detector hits impede a truthful reconstruction, including enhanced "zone lines" with high atomic impact intensity. Since APT is destructive, simulation is the only approach to explain the origin of these zone lines, but previous work couldn't reproduce them. Here, we use a new simulation technique that adds the full electrostatic forces to the interatomic forces in a molecular-dynamics simulation and eliminates the previous ad-hoc assumptions. We find for the canonical example of tungsten that evaporation happens when the electrostatic force overpowers the interatomic force, and the misalignment of the two forces deviates the launch direction of the atoms in certain zones, giving rise to an accumulation of hit events around zone lines.
