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相关概念视频

Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which are...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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
Electron tomography can be performed either in TEM or STEM (scanning transmission...

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相关实验视频

Updated: Jul 12, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

Published on: October 9, 2012

固态光电子光谱学与同步电子辐射.

J H Weaver, G Margaritondo

    Science (New York, N.Y.)
    |October 12, 1979
    PubMed
    概括

    同步子辐射增强了光电子谱学,彻底改变了对固体和表面电子行为的研究. 这种技术可以直接绘制电子带结构和表面分析.

    科学领域:

    • 物理 物理学 物理
    • 化学 化学 化学
    • 材料科学 材料科学 材料科学
    • 生物学 生物学 生物学

    背景情况:

    • 同步辐射提供了强烈的,可调节的,极化和稳定的光子束.
    • 这些光束对各种科学研究领域产生重大影响.
    • 固态光电子谱学是研究电子性质的关键技术.

    研究的目的:

    • 讨论使用同步辐射的基本光发射技术.
    • 突出了解固体和表面的电子行为方面的进步.
    • 为了展示表面科学中的最新应用.

    主要方法:

    • 利用同步子辐射源用于光电子光谱学.
    • 在光发射技术中使用可调的表面灵敏度.
    • 直接映射电子带结构.

    主要成果:

    • 同步子辐射已经彻底改变了固态光电子光谱学.
    • 技术提供可调整的表面灵敏度.
    • 现在可以直接绘制电子带结构的地图.

    结论:

    更多相关视频

    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
    09:00

    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

    Published on: June 28, 2018

    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
    09:53

    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

    Published on: October 30, 2012

    相关实验视频

    Last Updated: Jul 12, 2026

    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
    08:53

    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures

    Published on: October 9, 2012

    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
    09:00

    Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

    Published on: June 28, 2018

    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
    09:53

    Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

    Published on: October 30, 2012

    • 用同步电子辐射进行光电子光谱学是一种强大的工具.
    • 它提供了对电子带结构的直接洞察.
    • 应用包括化学吸收和表面结构的详细研究.