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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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光发射轨道断层扫描使用坚固的稀疏阶段提升.

K Niki1, R Asano1, R Sakanoue1

  • 1Graduate School of Science, Chiba University, Chiba 263-8522, Japan.

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概括
此摘要是机器生成的。

一种新的PhaseLift光发射轨道断层扫描 (POT) 方法简化了分子轨道可视化. 这种低成本的技术准确地重建3D分子轨道,并从实验数据中检测微妙的分子变形.

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科学领域:

  • 化学物理 化学物理
  • 材料科学 材料科学 材料科学
  • 量子化学 是一个量子化学.

背景情况:

  • 光发射轨道断层扫描 (POT) 使用光电子动量图 (PMM) 可视化分子轨道 (MO) 形状.
  • 现有的POT方法需要进一步简化和降低成本,以便更广泛地应用.

研究的目的:

  • 开发一种简单,低成本,准确的光发射轨道断层扫描 (POT) 方法.
  • 从实验数据中实现分子轨道 (MO) 及其相的直接3D重建.

主要方法:

  • 介绍了一种基于PhaseLift算法 (PhaseLift POT) 的新型POT方法.
  • 利用提升程序将PMM转换为提升的MO系数的第一阶多项式.
  • 开发了稀疏的PhaseLift POT,通过结合MO系数的稀疏性来提高从杂的PMM数据中提取相位的准确性.

主要成果:

  • 从单个实验PMM成功重建了包括波函数相在内的三维MO.
  • 以0.05 [Å]准确度实现了吸附诱导的分子变形的精确确定.
  • 通过放松匹配条件来证明稀疏的PhaseLift POT对实验噪声的稳定性.

结论:

  • PhaseLift POT为分子轨道可视化提供了一种创新且易于使用的工具.
  • 该方法精确确定分子结构,适用于分析化学反应和激发过程中的分子动力学.