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相关概念视频

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

2.1K
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...
2.1K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

379
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.
379
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

161
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...
161
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

607
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...
607
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

183
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,...
183
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

218
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....
218

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相关实验视频

Updated: Jun 30, 2025

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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用电子加速器测量光子核反应截面的方法基于贝叶斯分析.

Saverio Braccini1, Pierluigi Casolaro2, Gaia Dellepiane1

  • 1Albert Einstein Center for Fundamental Physics (AEC), Laboratory for High Energy Physics (LHEP), University of Bern, 3012, Bern, Switzerland.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
|March 14, 2024
PubMed
概括

研究人员开发了一种新的方法来测量光子核反应截面,使用微子加速器和高纯度日耳曼光谱仪. 这种技术对于核医学和辐射屏蔽的应用至关重要.

关键词:
贝叶斯分析是贝叶斯分析.截面截面是指截面的截面.电子加速器中的电子加速器.光子核反应的反应

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In Situ Detection and Single Cell Quantification of Metal Oxide Nanoparticles Using Nuclear Microprobe Analysis
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X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells
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科学领域:

  • 核物理 核物理 核物理
  • 计量学 计量学 计量学

背景情况:

  • 准确的光子核反应截面数据对于各种应用至关重要.
  • 关键应用包括辐射屏蔽,吸收剂量计算,反应堆物理,核安全措施,天体物理学和核医学.

研究的目的:

  • 建立使用微子加速器测量光子核反应截面的方法.
  • 为了研究225Ac,47Sc和67Cu等放射性核酸的产生.

主要方法:

  • 在瑞士联邦计量研究所 (METAS) 使用了微子加速器.
  • 用高纯度 (HPGe) 光谱仪测量产生的活性.
  • 通过蒙特卡洛模拟确定光子流动频谱.
  • 在数据分析中采用贝叶斯拟合程序与布雷特-维格纳函数.

主要成果:

  • 通过测量197Au(γ,n) 196Au反应截面来验证方法.
  • 获得的结果与现有的文献值一致.

结论:

  • 开发的方法提供了光子核反应截面的准确测量.
  • 这种技术适用于研究放射性核素生产和其他关键应用.