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相关概念视频

Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

3.3K
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...
3.3K
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

2.0K
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
2.0K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.5K
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.
1.5K
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

4.1K
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
4.1K
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

1.8K
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
1.8K
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

1.1K
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...
1.1K

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相关实验视频

Updated: Mar 18, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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一个固态人造原子的振幅光谱.

David M Berns1, Mark S Rudner, Sergio O Valenzuela

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Nature
|September 5, 2008
PubMed
概括

振幅光谱为研究量子系统提供了一种新的方法,通过使用场幅而不是频率来研究量子系统. 这种方法克服了传统频谱学的局限性,特别是在高频范围内.

科学领域:

  • 量子力学就是量子力学.
  • 频谱学是一种光谱学.
  • 原子物理 原子物理

背景情况:

  • 量子系统的行为是由能级结构决定的,可以通过光谱线观察到.
  • 传统的频谱学调整电磁场的频率,以匹配能量水平的分离.
  • 高频谱学 (几十到几百千兆赫) 对传统方法提出了重大挑战.

研究的目的:

  • 引入振幅光谱作为频率光谱的补充技术.
  • 克服基于宽带频率的方法的局限性,特别是在高频系统中.
  • 提供一种在广带宽上操纵和表征量子系统的方法.

主要方法:

  • 利用一个和驱动场,以固定频率将一个人造原子扫过避免的能量水平交叉.
  • 从系统响应的幅度依赖获得光谱信息.
  • 在参数空间中分析"光谱钻石",揭示干扰模式和群体反转.

主要成果:

  • 振幅光谱学成功地探测了量子系统的能量层结构.
  • 这些"光谱钻石"表现出明显的干扰模式和群体反转.
  • 这种技术允许通过区分特定能量水平对之间的过渡来表征光谱.

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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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结论:

  • 振幅光谱为研究量子系统提供了一个强大的替代方案,特别是在具有挑战性的高频率下.
  • 该方法利用幅度调制在单个,潜在的低得多的驱动频率.
  • 这种方法为量子系统提供了广泛的带宽操纵和表征能力.