Comparison of soft X-ray spectro-ptychography and scanning transmission X-ray microscopy

IF 1.8 4区 物理与天体物理 Q2 SPECTROSCOPY
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引用次数: 0

Abstract

Over the past decade advances in instrumentation and software have enabled development of spectro-ptychography (SP) as a higher spatial resolution extension of scanning transmission X-ray microscopy (STXM). Direct comparisons are made of same-area chemical state imaging of Cu nanoparticles using STXM and SP in order to compare and contrast the two approaches. We show that SP gives very similar chemical state information as STXM with significantly better spatial resolution and much higher quality images and chemical maps, on account of finer pixels in the reconstructed images. When defocused spot sizes are used (i.e., 1–3 μm, as opposed to full-focus 30–50 nm) SP data acquisition is faster and the radiation dose delivered to the sample is smaller than the corresponding STXM measurement. The limitations of SP are primarily related to the time and complexity of the ptychographic reconstruction. We argue that these documented advantages mean that SP rather than STXM should be used for more complex studies such as tomography and in situ studies, especially when radiation damage is a concern. The main point of this manuscript is to illustrate, with scientifically relevant samples, the significant advantages of SP relative to conventional STXM, with the goal of encouraging greater use of SP.
软 X 射线分光透射显微镜与扫描透射 X 射线显微镜的比较
在过去的十年中,仪器和软件的进步使得光谱透射显微镜(SP)得以发展,成为扫描透射 X 射线显微镜(STXM)的更高空间分辨率的延伸。我们使用 STXM 和 SP 对铜纳米粒子的同区域化学状态成像进行了直接比较,以便对这两种方法进行比较和对比。结果表明,SP 提供的化学状态信息与 STXM 非常相似,但由于重建图像的像素更细,空间分辨率明显更高,图像和化学图的质量也更高。当使用散焦光斑尺寸时(即 1-3 μm,而不是全焦的 30-50 nm),SP 数据采集速度更快,而且投射到样品上的辐射剂量小于相应的 STXM 测量。SP 的局限性主要涉及到层析重建的时间和复杂性。我们认为,这些有据可查的优势意味着,在断层扫描和原位研究等更复杂的研究中,尤其是在担心辐射损伤的情况下,应使用 SP 而不是 STXM。本手稿的主要目的是通过与科学相关的样本来说明 SP 相对于传统 STXM 的显著优势,从而鼓励更多地使用 SP。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.30
自引率
5.30%
发文量
64
审稿时长
60 days
期刊介绍: The Journal of Electron Spectroscopy and Related Phenomena publishes experimental, theoretical and applied work in the field of electron spectroscopy and electronic structure, involving techniques which use high energy photons (>10 eV) or electrons as probes or detected particles in the investigation.
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