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相关概念视频

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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...
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: Interference01:30

Atomic Emission Spectroscopy: Interference

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,...
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.

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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

时间分辨率电子能量损失光谱学

T H Ellis, L H Dubois, S D Kevan

    Science (New York, N.Y.)
    |October 18, 1985
    PubMed
    概括

    高分辨率电子能量损失光谱现在可以在毫秒内捕获表面振动光谱. 这一突破使表面反应的直接实时测量成为可能,进步了对表面动力学的分子层次理解.

    科学领域:

    • 表面科学是一门学科.
    • 频谱学是一种光谱学.
    • 化学动力学 化学动力学

    背景情况:

    • 了解表面反应对于催化和材料科学至关重要.
    • 以前的方法缺乏时间分辨率来观察快速的表面过程.
    • 直接测量表面速度过程需要先进的光谱技术.

    研究的目的:

    • 为了证明毫秒时间尺度表面振动光谱学的能力.
    • 为了研究酸在Cu100上的吸附和分解.
    • 为了研究甲醇分解在Ni{\displaystyle Ni}110上的动力学和Cu{\displaystyle Cu}100上的CO溶解.

    主要方法:

    • 利用高分辨率电子能量损失光谱 (HREELS) 的仪器改进.
    • 实现整个表面振动光谱的毫秒时间尺度分辨率.
    • 实时监测表面吸附,分解和脱吸事件.

    主要成果:

    • 在酸分解过程中,甲酸中间体的详细温度和覆盖范围的依赖性.
    • 在Ni{110}上对甲醇分解路径的综合分析.
    • 在Cu{100}上直接测量一氧化碳停留时间和脱落动力学.

    更多相关视频

    Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
    07:55

    Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

    Published on: April 17, 2018

    Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
    10:02

    Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

    Published on: May 27, 2021

    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

    Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
    07:55

    Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering

    Published on: April 17, 2018

    Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
    10:02

    Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

    Published on: May 27, 2021

    结论:

    • 毫秒HREELS为表面反应动态提供了前所未有的洞察力.
    • 现在可以在分子水平上直接进行动力测量.
    • 这种技术为了解和控制表面过程开辟了新的途径.