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相关概念视频

Atomic Force Microscopy01:08

Atomic Force Microscopy

3.4K
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
3.4K
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

734
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
734
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.0K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.0K
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

587
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
587
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

683
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
683
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

197
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
197

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相关实验视频

Updated: Jun 23, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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在商用反射子型原子探测器中补偿图像扭曲.

Martina Heller1,2, Benedict Ott1, Peter Felfer1

  • 1Department of Materials Science, Institute for General Materials Properties, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Martensstr.5, Erlangen 91058, Germany.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|June 26, 2024
PubMed
概括

本研究为用户提供了一种方法来确定反射子原子探针仪器的成像特性,从而提高3D重建的准确性. 这使得通过转换探测器数据以获得更好的空间分辨率,可以进行精确的材料分析.

关键词:
对APT数据进行更正.探测器原子探测器原子探测器这是一个反射子反射子.

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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

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Picometer-Precision Atomic Position Tracking through Electron Microscopy
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Picometer-Precision Atomic Position Tracking through Electron Microscopy

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相关实验视频

Last Updated: Jun 23, 2025

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid

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Picometer-Precision Atomic Position Tracking through Electron Microscopy
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Picometer-Precision Atomic Position Tracking through Electron Microscopy

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科学领域:

  • 材料科学 材料科学 材料科学
  • 分析化学 分析化学
  • 物理 物理学 物理

背景情况:

  • 原子探头断层扫描 (APT) 中精确的3D重建对于空间分辨率和数据完整性至关重要.
  • 基于反射子的APT仪器提供了增强的质量分辨能力,但需要精确建模反射子成像特性.
  • 专有仪器设计往往使这些成像属性无法被用户访问,从而阻碍了精确的重建.

研究的目的:

  • 开发一种用户可访问的方法来确定APT中反射子系统的成像特性.
  • 为将探测器数据转换为虚拟探测器平面提供转换函数,简化3D重建.
  • 为了提高商业广角反射子APT仪器中的3D重建的准确性和可靠性.

主要方法:

  • 开发了一种用于直接在商业APT仪器上描述反射子成像特性的实用方法.
  • 实现了一个转换函数,将探测器数据映射到位于反射子前的虚拟探测器.
  • 提供了CAMECA LEAP系列仪器 (3000, 4000, 5000, 6000) 的校正算法和参考数据.

主要成果:

  • 成功确定了反射子的成像特性,用于基于用户的分析.
  • 建立了一种可靠的方法来转换探测器数据,从而实现一致的3D重建.
  • 证明了该方法在多个CAMECA LEAP仪器模型中的适用性.

结论:

  • 开发的方法使用户能够准确地建模反射子成像特性,克服制造商特定的限制.
  • 这有助于提高3D重建的准确性和反射波APT中的数据解释.
  • 提供的算法和数据增强了材料分析先进APT技术的实用性和可访问性.