力显微镜针尖与离子晶体表面相互作用的亚稳态模拟
Simulations of metastable states near the apex of a force microscope tip interacting with an ionic crystalline surface
摘要：
动态力显微镜（DFM）中使用的探针尖端拾取的原子或离子对在接近样品表面时会发生强烈的位移，甚至不连续地跳跃。其中一些跳跃的能量势垒具有正确的数量级，可以解释在室温下DFM测量中通常观察到的能量耗散的上升。本文所报道的系统计算可以解释在以前的DFM研究中对KBr（001）样品的低温下观察到的罕见跳跃和非常低的平均能量耗散。在靠近表面的地方，我们确实发现了被小能量势垒分隔开的新态，这解释了这些现象。这些能量势垒强烈地依赖于尖端顶点附近的原子排列的细节。
英文摘要：
Atoms or pairs of ions picked up by probe tips used in dynamic force microscopy (DFM) can be strongly displaced and even hop discontinuously upon approach to the sample surface. The energy barriers for some of those hops are of the right order of magnitude to explain the rise in energy dissipation commonly observed in DFM measurements at room temperature. The systematic computations reported here can explain the infrequent jumps and very low average energy dissipation observed low temperature in a previous DFM study on a KBr(001) sample. Close to the surface we indeed find new states separated by small energy barriers which account for those phenomena. These energy barriers strongly depend on details of the atomic arrangement in the vicinity of the tip apex.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
