Managing dose-, damage- and data-rates in multi-frame spectrum-imaging
Managing dose-, damage- and data-rates in multi-frame spectrum-imaging
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DOI：
10.1093/jmicro/dfx125
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发表时间：
2018-03-01
期刊：
影响因子：
1.8
通讯作者：
Nellist, Peter D.
中科院分区：
文献类型：
--
作者：
Jones, Lewys;Varambhia, Aakash;Nellist, Peter D.
作为一种仪器，扫描透射电子显微镜的独特之处在于能够同时在原子尺度上探索材料的局部结构和化学变化。这是可能的，因为这两种类型的数据是连续获得的，同时来自样品与一个尖锐聚焦的电子探针的相互作用。不幸的是，这种扫描数据可能会被环境因素扭曲，尽管最近快速扫描的多帧成像方法已被证明可以减轻这些影响。在这里，我们演示了相同的方法，但针对光谱数据进行了优化；我们对多帧光谱成像（MFSI）的新潜力提出了一些观点，并展示了剂量共享方法如何减少样品损伤，提高晶体保真度，增加数据信噪比，或最大化可用视野。此外，我们讨论了MFSI中数据速率过高的潜在问题，并演示了一种文件压缩方法，以显着减少数据存储和传输负担。
As an instrument, the scanning transmission electron microscope is unique in being able to simultaneously explore both local structural and chemical variations in materials at the atomic scale. This is made possible as both types of data are acquired serially, originating simultaneously from sample interactions with a sharply focused electron probe. Unfortunately, such scanned data can be distorted by environmental factors, though recently fast-scanned multi-frame imaging approaches have been shown to mitigate these effects. Here, we demonstrate the same approach but optimized for spectroscopic data; we offer some perspectives on the new potential of multi-frame spectrum-imaging (MFSI) and show how dose-sharing approaches can reduce sample damage, improve crystallographic fidelity, increase data signal-to-noise, or maximize usable field of view. Further, we discuss the potential issue of excessive data-rates in MFSI, and demonstrate a file-compression approach to significantly reduce data storage and transmission burdens.