arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.10918cond-mat.mtrl-sciphysics.chem-ph
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基于超快动量显微镜和稀疏驱动相位恢复的高效轨道成像

Efficient orbital imaging based on ultrafast momentum microscopy and sparsity-driven phase retrieval

G. S. M. Jansen, M. Keunecke, M. Düvel, C. Möller, D. Schmitt, W. Bennecke, F. J. S. Kappert, D. Steil, D. R. Luke, S. Steil, S. Mathias

摘要:

我们提出了能量分辨的光电子动量地图的轨道断层扫描,已收集到一个新的和有效的飞行时间动量显微镜设置。该装置与0.5 MHz桌面飞秒极紫外光源相结合,可实现前所未有的数据收集速度,并为未来的时间分辨轨道成像实验铺平道路。此外,我们在轨道成像的数据分析过程中向前迈出了重要的一步,并提出了一个稀疏驱动的方法所需的相位恢复问题,它只使用轨道中的非零像素的数量。这里,不需要对象支持的知识,并且稀疏数可以容易地从测量数据确定。在放松的平均交替反射算法中使用,这种稀疏约束使我们的实验以及无噪声和嘈杂的模拟光电子动量图数据的快速和可靠的相位检索。

英文摘要:

We present energy-resolved photoelectron momentum maps for orbital tomography that have been collected with a novel and efficient time-of-flight momentum microscopy setup. This setup is combined with a 0.5 MHz table-top femtosecond extreme-ultraviolet light source, which enables unprecedented speed in data collection and paves the way towards time-resolved orbital imaging experiments in the future. Moreover, we take a significant step forward in the data analysis procedure for orbital imaging, and present a sparsity-driven approach to the required phase retrieval problem, which uses only the number of non-zero pixels in the orbital. Here, no knowledge of the object support is required, and the sparsity number can easily be determined from the measured data. Used in the relaxed averaged alternating reflections algorithm, this sparsity constraint enables fast and reliable phase retrieval for our experimental as well as noise-free and noisy simulated photoelectron momentum map data.

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