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相关概念视频

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

3.5K
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

556
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.6K
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

587
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Emission Spectra02:39

Emission Spectra

75.5K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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相关实验视频

Updated: Jan 12, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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贝特山脊电子 康普顿光谱学

B G Mendis1, S P Hayes1, Cog Williamson1

  • 1Dept. of Physics, Durham University, South Road, Durham, DH1 3LE, UK.

Ultramicroscopy
|October 31, 2025
PubMed
概括
此摘要是机器生成的。

能量过传输电子显微镜 (EFTEM) 为康普顿光谱学提供了一种剂量高效的方法,测量电子状态密度. 这种技术,使用贝特脊,提供类似的J(pz) 信息,以电子能量损失光谱,在薄型标本中可管理的工件.

关键词:
在Bethe山脊上.康普顿散射是一种散射.电子结合异性质的电子结合异性质.能量过衍射的能量过.

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Last Updated: Jan 12, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 电子显微镜电子显微镜

背景情况:

  • 康普顿光谱法是一种用于测量J (pz) 的技术,该技术是用动量成分pz测量占用电子状态的数密度.
  • 在传输电子显微镜 (TEM) 中,这传统上是使用暗场电子能量损失光谱 (EELS) 进行的.

研究的目的:

  • 为了研究使用Bethe峰在能量过的TEM (EFTEM) 衍射模式用于康普顿光谱学的可行性.
  • 为了比较EFTEM方法的剂量效率和结果与传统的暗场ELS.

主要方法:

  • 在TEM中获取能量过的衍射模式.
  • 在这些模式中分析贝特山脊特征,以提取J (pz) 信息.
  • 通过EFTEM获得的J (pz) 档案与来自暗场ELS的J (pz) 档案的比较.

主要成果:

  • 在EFTEM衍射模式中的Bethe提供了与暗场EELS.相比的J(pz) 信息.
  • 在EFTEM方法是更高效的剂量,因为它记录所有的预测时刻并行.
  • 来自EFTEM的J ((pz) 档案显示,对于微弱衍射的标本,与暗场ELS有合理的协议.

结论:

  • 使用Bethe脊的EFTEM是TEM中康普顿光谱的可行且剂量更高效的替代方案.
  • 布拉格衍射和热扩散散射的影响影响EFTEM,但可以通过使用薄样本来减轻.